Dog food is food specifically formulated and intended for consumption by

dog The dog (''Canis familiaris'' or ''Canis lupus familiaris'') is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from the extinct Pleistocene wolf, and the modern wolf is the dog's nearest living relative. Do ...

s and other related canines. Dogs are considered to be

omnivore An omnivore () is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize the nutr ...

s with a

carnivorous A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant whose food and energy requirements derive from animal tissues (mainly muscle, fat and other sof ...

bias. They have the sharp, pointed teeth and shorter gastrointestinal tracts of carnivores, better suited for the consumption of meat than of vegetable substances, yet also have ten genes that are responsible for

starch Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants for energy storage. Worldwide, it is the most common carbohydrate in human diets ...

and

glucose Glucose is a simple sugar with the molecular formula . Glucose is overall the most abundant monosaccharide, a subcategory of carbohydrates. Glucose is mainly made by plants and most algae during photosynthesis from water and carbon dioxide, using ...

digestion, as well as the ability to produce

amylase An amylase () is an enzyme that catalyses the hydrolysis of starch (Latin ') into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. Foods that contain large amounts of ...

, an enzyme that functions to break down carbohydrates into simple sugars – something that

obligate carnivores A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant whose food and energy requirements derive from animal tissues (mainly muscle, fat and other sof ...

like cats lack. Dogs evolved the ability living alongside humans in agricultural societies, as they managed on scrap

leftover Leftovers are surplus foods remaining unconsumed at the end of a meal, which may be put in containers with the intention of eating later. Inedible remains like bones are considered ''waste'', not leftovers. Depending on the situation, the amoun ...

s and excrement from humans. * Dogs have managed to adapt over thousands of years to survive on the meat and non-meat scraps and

leftovers Leftovers are surplus foods remaining unconsumed at the end of a meal, which may be put in containers with the intention of eating later. Inedible remains like bones are considered ''waste'', not leftovers. Depending on the situation, the amoun ...

of human existence and thrive on a variety of foods, with studies suggesting dogs' ability to digest carbohydrates easily may be a key difference between dogs and wolves. In the United States alone, the dog food market is expected to reach $23.3 billion by 2022.

History

Prior to being domesticated, dogs, being

canines Canine may refer to: Zoology and anatomy * a dog-like Canid animal in the subfamily Caninae ** ''Canis'', a genus including dogs, wolves, coyotes, and jackals ** Dog, the domestic dog * Canine tooth, in mammalian oral anatomy People with the surn ...

, fended for themselves and survived on a

diet. After adapting them for protection, work, and companionship, people began to care at least in part for their nutritional needs. The historic record of this changing approach dates back at least 2,000 years. In 37 BCE,

Virgil Publius Vergilius Maro (; traditional dates 15 October 7021 September 19 BC), usually called Virgil or Vergil ( ) in English, was an ancient Roman poet of the Augustan period. He composed three of the most famous poems in Latin literature: t ...

talks about the feeding of dogs in his ''Bucolics'': Around 70 CE,

Columella Lucius Junius Moderatus Columella (; Arabic: , 4 – ) was a prominent writer on agriculture in the Roman Empire. His ' in twelve volumes has been completely preserved and forms an important source on Roman agriculture, together with the wo ...

wrote his book ''On Agriculture'' in which he addresses the feeding of dogs: In the ''

Avesta The Avesta () is the primary collection of religious texts of Zoroastrianism, composed in the Avestan language. The Avesta texts fall into several different categories, arranged either by dialect, or by usage. The principal text in the litu ...

'', written from 224 to 651 CE, Azura Mazda advises: By Medieval times, dogs were more seen as pets rather than just companions and workers which affected their quality of the diet to include "Besides being fed bran bread, the dogs would also get some of the meat from the hunt. If a dog was sick, he would get better food, such as goat's milk, bean broth, chopped meat, or buttered eggs." In France, the word ''pâtée'' began to appear in the 18th century and referred to a paste originally given to poultry. In 1756, a dictionary indicates it was made of a mixture of bread crumbs and little pieces of meat given to pets. In 1781, an encyclopedia mentioned an earlier practice of removing the liver, heart, and blood of a downed stag and mixing it with milk, cheese, and bread, and then giving it to dogs. In 1844, the French writer, Nicolas Boyard, warned against even giving tallow

graves A grave is a location where a dead body (typically that of a human, although sometimes that of an animal) is buried or interred after a funeral. Graves are usually located in special areas set aside for the purpose of burial, such as gravey ...

(the dregs of the

tallow Tallow is a rendering (industrial), rendered form of beef or mutton fat, primarily made up of triglycerides. In industry, tallow is not strictly defined as beef or mutton fat. In this context, tallow is animal fat that conforms to certain techn ...

pot) to dogs, though the English favored them (see below), and suggested a meat-flavored soup: In England, care to give dogs particular food dates at least from the late eighteenth century, when ''The Sportsman's dictionary'' (1785) described the best diet for a dog's health in its article "Dog": In 1833, ''The Complete Farrier'' gave similar but far more extensive advice on feeding dogs: It was not until the mid-1800s that the world saw its first food made specifically for dogs. An American electrician, James Spratt, concocted the first dog treat. Living in London at the time, he witnessed dogs around a shipyard eating scraps of discarded biscuits. Shortly thereafter he introduced his dog food, made up of wheat meals, vegetables and meat. By 1890 production had begun in the United States and became known as "Spratt's Patent Limited". In later years,

dog biscuit A dog biscuit is a hard biscuit-based dietary supplement for dogs or other canines, similar to human snack food. Dog biscuits tend to be hard and dry. Dog biscuits may be sold in a flat bone-shape. The dry and hard biscuit texture helps clean ...

was sometimes treated as synonymous with dog food: Canned

horse meat Horse meat forms a significant part of the culinary traditions of many countries, particularly in Eurasia. The eight countries that consume the most horse meat consume about 4.3 million horses a year. For the majority of humanity's early existe ...

was introduced in the United States under the

Ken-L Ration Ken-L Ration was a brand of canned and dry dog food. Ken-L Ration was owned by Quaker Oats, but the brand was sold to H. J. Heinz Company, H. J. Heinz Co. in 1995. The brand's name was a play on the World War II-era K-ration, and featured a yello ...

brand after

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

as a means to dispose of excess horses no longer needed for the war. The 1930s saw the introduction of canned cat food and dry meat-meal dog food by the Gaines Food Co. By the time World War II ended, pet food sales had reached $200 million. In the 1950s Spratt's became part of General Mills. For companies such as Nabisco, Quaker Oats, and General Foods, pet food represented an opportunity to market by-products as a profitable source of income.

Commercial varieties

Most commercially produced dog food is made with animal feed grade ingredients and comes dry in bags (also known in the US as ''kibble'') or wet in cans. Dry food contains 6–10% moisture by volume, as compared to 60–90% in canned food. Semi-moist products typically run 25–35%. Isotopic analysis of dog food in the Brazilian market have found that they are basically made of maize and poultry by-products.

Dry

Dry dog food usually consists of bagged nuts that contain 3-11% water. It makes up the vast majority of pet foods. Dry food is both convenient and typically inexpensive, with over $8 billion worth being sold in 2010 – a 50% increase over just seven years earlier.

Manufacturing process

Dry food processing is popular in the pet food industry, as it is an efficient way to supply continuous production of feed in many varieties. It is energy efficient, allows for large amounts of feed to be used, and is cost effective. To make dog nuts, a process known as

extrusion Extrusion is a process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section. Its two main advantages over other manufacturing processes are its ability to create very complex c ...

is done. A simple extruder consists of a barrel, helical screws, and a die (tool to cut and shape food). Feed ingredients are solid at room temperature; therefore, the extrusion process of these ingredients requires a temperature above 150 degrees Celsius, achieved by the use of steam, hot water, or other heat sources in order to soften or melt the mixture and allow for fluidity through the barrel. During the extrusion process, the high amounts of pressure applied to the mixture forces it to enter through the die before exiting the extruder completely, where it is cut to its desired size by a rotating fly knife. Unfortunately, the extrusion process actually denatures some of nutritional elements of the food. Taurine deficiency has been found in dogs and cats fed extruded commercial diets. Not usually considered an essential nutrient for dogs, taurine is plentiful in most whole meats, whether raw or cooked, but is reduced in extruded diets. Taurine deficiency could also be due to the use of rendered, highly processed meat sources that are low in taurine. Regardless of the cause, taurine is now artificially supplemented back into the diet after processing in the production of most commercial pet food.

Wet

Wet or canned dog food usually is packaged in a solid or soft-sided container. Wet food contains roughly 60-78% water, which is significantly higher in moisture than dry or semi-moist food.Messonnier, S. (2001) ''Natural Health Bible for Dogs & Cats''. New York: Three Rivers Press. Canned food is commercially sterile (cooked during canning); other wet foods may not be sterile. Sterilizing is done through the process of retorting, which involves steam sterilization at 121 degrees Celsius.Bohart, G.S. (1934). ''United States Patent No. 1961681''. Washington, D.C.:United States Patent Office.Baker, G.J., Bansal, A.K., Konieczka, J.L. and Kuntz, D.A. (1990). ''United States Patent No. 4895731''. Chicago, Illinois: United States Patent Office. A given wet food will often be higher in protein or fat compared to a similar dry food on a dry matter basis (a measure which ignores moisture); given the canned food's high moisture content. A larger amount of canned food must be fed in order to meet the dog's required needs. Grain gluten and other protein gels may be used in wet dog food to create artificial meaty chunks, which look like real meat. This food is usually used for old dogs or puppies.

Manufacturing process

After ingredients are combined, they are placed in a tank at the end of a canning machine. From there, the mixture is forced through an opening and onto a metal sheet, forming a thickness of 8 to 12mm. Next, the mixture is heated to thoroughly cook the ingredients. Heating can be done through the means of ovens, microwaves or steam heating. The sheet containing a layer of feed is passed through the heat source that displays heat to the top and bottom of the tray, allowing the internal temperature to reach 77 degrees Celsius at a minimum. Once cooked, this mixture can be directly placed into cans to form a loaf or it can be cut into "meaty" pieces for chunks and gravy formulas.

Semi-moist

Semi-moist dog food is packaged in vacuum-sealed pouches or packets. It contains about 20-45% water by weight, making it more expensive per energy calorie than dry food. Most semi-moist food does not require refrigeration. They are lightly cooked and then quickly sealed in a vacuum package. This type of dog food is extremely vulnerable to spoiling if not kept at a cool temperature and has a shelf life of 2–4 months, unopened.

Dehydrated and freeze-dried

Dehydrated In physiology, dehydration is a lack of total body water, with an accompanying disruption of metabolic processes. It occurs when free water loss exceeds free water intake, usually due to exercise, disease, or high environmental temperature. Mil ...

freeze-dried Freeze drying, also known as lyophilization or cryodesiccation, is a low temperature dehydration process that involves freezing the product and lowering pressure, removing the ice by sublimation. This is in contrast to dehydration by most conve ...

meals come in raw and cooked forms. Products are usually air-dried or frozen, then dehydrated (freeze-dried) to reduce moisture to the level where bacterial growths are inhibited. The appearance is very similar to dry dog nuts. The typical feeding methods include adding warm water before serving. There is some concern of nutrients, such as vitamins, being lost during the dehydration process. Specialty small batches sold through specialty or online stores generally consist of some form of cooked meat, ground bone, pureed vegetables, taurine supplements, and other multivitamin supplements. Some pet owners use human vitamin supplements, and others use vitamin supplements specifically engineered for dogs.

Many commercial dog foods are made from materials considered by some authorities and dog owners to be unusable or undesirable. These may include: *

Meat and bone meal Meat and bone meal (MBM) is a product of the rendering industry. It is typically about 48–52% protein, 33–35% ash, 8–12% fat, and 4–7% water. It is primarily used in the formulation of animal feed to improve the amino acid profile of t ...

Offal Offal (), also called variety meats, pluck or organ meats, is the organs of a butchered animal. The word does not refer to a particular list of edible organs, which varies by culture and region, but usually excludes muscle. Offal may also refe ...

(wild canines eat offal as a vital part of their diets) * Animal digest *

Sucrose Sucrose, a disaccharide, is a sugar composed of glucose and fructose subunits. It is produced naturally in plants and is the main constituent of white sugar. It has the molecular formula . For human consumption, sucrose is extracted and refined ...

and/or

fructose Fructose, or fruit sugar, is a Ketose, ketonic monosaccharide, simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galacto ...

Animal by-products An animal product is any material derived from the body of an animal. Examples are fat, flesh, blood, milk, eggs, and lesser known products, such as isinglass and rennet. Animal by-products, as defined by the USDA, are products harvested or ma ...

Less expensive dog foods generally include less meat and more

animal by-products An animal product is any material derived from the body of an animal. Examples are fat, flesh, blood, milk, eggs, and lesser known products, such as isinglass and rennet. Animal by-products, as defined by the USDA, are products harvested or ma ...

and grain

fillers In processed animal foods, a filler is an ingredient added to provide dietary fiber, bulk or some other non-nutritive purpose. Products like corncobs, feathers, soy, cottonseed hulls, peanut hulls, citrus pulp, screening, weeds, straw, and cere ...

. Proponents of a natural diet criticize the use of such ingredients, and point out that regulations allow for packaging that might lead a consumer to believe that they are buying natural food, when, in reality, the food might be composed mostly of ingredients such as those listed above. More expensive dog foods may be made of ingredients suitable for organic products or free range meats. Lamb meal is a popular ingredient. According to the

Association of American Feed Control Officials The Association of American Feed Control Officials (AAFCO) is a non-profit organization which sets standards for the quality and safety of animal feed (fodder) and pet food in the United States. AAFCO is a voluntary organization consisting largely ...

(AAFCO), animal by-products in pet food may include parts obtained from any animals that have died from sickness or disease, provided they are rendered in accordance to law. Cow brains and spinal cords not allowed for human consumption under federal regulation 21CFR589.2000 due to the possibility of transmission of

BSE BSE may refer to: Medicine * Bovine spongiform encephalopathy, also known as mad cow disease, a neurodegenerative disease of cattle * Breast self-examination Stock exchanges * Bahrain Stock Exchange, Bahrain * Baku Stock Exchange, Azerbaijan * B ...

are allowed to be included in pet food intended for non-ruminant animals. In 2003, the AVMA speculated changes might be made to animal feed regulations to ban materials from "4-D" animals – those who enter the food chain as dead, dying, diseased or disabled. Chatuchak Weekend Market P1100759

Quality, digestibility and energy density

There are a few key components to consider when evaluating dietary needs. These factors include the

quality Quality may refer to: Concepts *Quality (business), the ''non-inferiority'' or ''superiority'' of something *Quality (philosophy), an attribute or a property *Quality (physics), in response theory *Energy quality, used in various science discipli ...

and

digestibility Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intest ...

of the protein provided in the diet, as well as the composition of the amino acids included, and finally the

energy density In physics, energy density is the amount of energy stored in a given system or region of space per unit volume. It is sometimes confused with energy per unit mass which is properly called specific energy or . Often only the ''useful'' or extract ...

provided in the diet. Diets containing proteins that are high in quality, composition, and digestibility require less of that protein to be present. The same can be said in regards to the energy density. In contrast, high-protein diets will provide excess protein content after meeting maintenance demands; this can therefore lead to the protein being utilized in

fat In nutrition science, nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such chemical compound, compounds, most commonly those that occur in living beings or in food. The term often refers spec ...

and

energy storage Energy storage is the capture of energy produced at one time for use at a later time to reduce imbalances between energy demand and energy production. A device that stores energy is generally called an accumulator or battery. Energy comes in ...

. This ultimately increases the risk for developing

obesity Obesity is a medical condition, sometimes considered a disease, in which excess body fat has accumulated to such an extent that it may negatively affect health. People are classified as obese when their body mass index (BMI)—a person's we ...

and other health related issues. Higher protein in the diet helps reduce

lean body mass Lean body mass (LBM), sometimes conflated with ''fat-free mass'', is a component of body composition. Fat free mass (FFM) is calculated by subtracting body fat weight from total body weight: total body weight is lean plus fat. In equations: :LBM&n ...

loss, but will not lead to an increase in size of muscle unless paired with resistance exercises or

anabolic steroid Anabolic steroids, also known more properly as anabolic–androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone (medication), testosterone as well as synthetic androgens that are structurally related ...

s under maintenance conditions.

Labeling

In the United States, dog foods labelled as "complete and balanced" must meet standards established by the

(AAFCO), either by meeting a nutrient profile or by passing a feeding trial. The Dog Food Nutrient Profiles were last updated in 2016 by the AAFCO's Canine Nutrition Expert Subcommittee. Critics argue that due to the limitations of the trial and the gaps in knowledge within animal nutrition science, the term "complete and balanced" is inaccurate and even deceptive. An AAFCO panel expert has stated that "although the AAFCO profiles are better than nothing, they provide false securities." Certain manufacturers label their products with terms such as "premium", "ultra premium", "natural", and "holistic". Such terms currently have no legal definitions and are not regulated. There are also varieties of dog food labeled as "human-grade food." Although no official definition of this term exists, the assumption is that other brands use foods that would not pass US Food and Drug Administration inspection according to the

Pure Food and Drug Act The Pure Food and Drug Act of 1906, also known as Dr. Wiley's Law, was the first of a series of significant consumer protection laws which was enacted by Congress in the 20th century and led to the creation of the Food and Drug Administration. ...

or the

Meat Inspection Act The Federal Meat Inspection Act of 1906 (FMIA) is an American law that makes it illegal to adulterate or misbrand meat and meat products being sold as food, and ensures that meat and meat products are slaughtered and processed under strictly r ...

. The ingredients on the label must be listed in descending order by weight before cooking. This means before all of the moisture is removed from the meat, fruits, vegetables and other ingredients used.

Types of diets

Raw

Raw feeding is the practice of feeding domestic

cat The cat (''Felis catus'') is a domestic species of small carnivorous mammal. It is the only domesticated species in the family Felidae and is commonly referred to as the domestic cat or house cat to distinguish it from the wild members of ...

s and other animals a

diet Diet may refer to: Food * Diet (nutrition), the sum of the food consumed by an organism or group * Dieting, the deliberate selection of food to control body weight or nutrient intake ** Diet food, foods that aid in creating a diet for weight loss ...

consisting primarily of uncooked meat, edible bones, and organs. The ingredients used to formulate raw diets can vary. Some pet owners choose to make homemade raw diets to feed their animals but commercial raw food diets are also available. Frozen, or fresh-prepared, meals come in raw or cooked form, some of which is made with ingredients that are inspected, approved, and certified by the USDA for human consumption, but formulated for pets. Part of this growing trend is the commercialization of home-made dog food for pet owners who want the same quality, but do not have the time or expertise to make it themselves. The advantage is forgoing the processing stage that traditional dog food undergoes. This causes less destruction of its nutritional integrity. The practice of feeding raw diets has raised some concerns due to the risk of

foodborne illness Foodborne illness (also foodborne disease and food poisoning) is any illness resulting from the spoilage of contaminated food by pathogenic bacteria, viruses, or parasites that contaminate food, as well as prions (the agents of mad cow disease) ...

es,

zoonosis A zoonosis (; plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite or prion) that has jumped from a non-human (usually a vertebrate) to a human. ...

and nutritional imbalances. People who feed their dogs raw food do so for a multitude of reasons, including but not limited to:

culture Culture () is an umbrella term which encompasses the social behavior, institutions, and norms found in human societies, as well as the knowledge, beliefs, arts, laws, customs, capabilities, and habits of the individuals in these groups.Tyl ...

belief A belief is an attitude that something is the case, or that some proposition is true. In epistemology, philosophers use the term "belief" to refer to attitudes about the world which can be either true or false. To believe something is to take i ...

s surrounding

health Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity".World Health Organization. (2006)''Constitution of the World Health Organiza ...

nutrition Nutrition is the biochemical and physiological process by which an organism uses food to support its life. It provides organisms with nutrients, which can be metabolized to create energy and chemical structures. Failure to obtain sufficient n ...

and what is perceived to be more natural for their

pet A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive appearances, intelligence, ...

s. Feeding raw food can be perceived as allowing the pet to stay in touch with their wild, carnivorous ancestry. The raw food movement has occurred in parallel to the change in human food trends for more natural and

organic products An organic product is made from materials produced by organic agriculture. Most well known organic products are organic food items, however clothing and personal care items can also be made with organic agriculture. Many countries have strict c ...

Senior

Aging dogs require specialized catering. Commercially available

senior dog diet Senior dog food diets are pet foods that are catered toward the senior or mature pet population. The senior dog population consists of dogs that are over the age of seven for most dog breeds, though in general large and giant breed dogs tend to reac ...

s address their physiological changes through various ingredients and nutrients. When looking for a senior dog food, one of the first things that should be taken into consideration is the energy content of the diet. The maintenance energy requirements decrease as a dog ages due to the loss in lean body mass that occurs. Therefore, senior dogs will require a diet with a lowered energy content compared to non senior diets. Although senior dogs require lower energy content diets, they will also require diets that are higher in

protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, respo ...

and

protein digestibility Protein digestibility refers to how well a given protein is digested. Along with the amino acid score, protein digestibility determines the values for PDCAAS and DIAAS Digestible Indispensable Amino Acid Score (DIAAS) is a protein quality method p ...

. This is due to the fact that dogs have a reduced ability to synthesize proteins as they age.

Joint A joint or articulation (or articular surface) is the connection made between bones, ossicles, or other hard structures in the body which link an animal's skeletal system into a functional whole.Saladin, Ken. Anatomy & Physiology. 7th ed. McGraw ...

and

bone A bone is a Stiffness, rigid Organ (biology), organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the various other organs of the body, produce red blood cell, red and white blood cells, store minerals, provid ...

health is an important factor to be considered when purchasing a senior dog food. The addition of

glucosamine Glucosamine (C6H13NO5) is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids. Glucosamine is part of the structure of two polysaccharides, chitosan and chitin. Glucosamine is one of the most ...

and

chondroitin sulfate Chondroitin sulfate is a sulfated glycosaminoglycan (GAG) composed of a chain of alternating sugars ( N-acetylgalactosamine and glucuronic acid). It is usually found attached to proteins as part of a proteoglycan. A chondroitin chain can have ove ...

has been shown to improve

cartilage Cartilage is a resilient and smooth type of connective tissue. In tetrapods, it covers and protects the ends of long bones at the joints as articular cartilage, and is a structural component of many body parts including the rib cage, the neck an ...

formation, the composition of

synovial fluid Synovial fluid, also called synovia, elp 1/sup> is a viscous, non-Newtonian fluid found in the cavities of synovial joints. With its egg white–like consistency, the principal role of synovial fluid is to reduce friction between the articular ...

, as well as improve signs of osteoarthritis. The

calcium Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to ...

phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ...

ratio of senior dog foods is also important. Calcium and phosphorus are considered essential nutrients, according to AAFCO.

Gastrointestinal The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organs of the digestive system, in humans and ...

health is another important factor to consider in the aging dog. Sources of

fiber Fiber or fibre (from la, fibra, links=no) is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorporate ...

such as

beet pulp Beet pulp is a byproduct from the processing of sugar beet which is used as fodder for horses and other livestock. Beet pulp is the fibrous material left over after the sugar is extracted from sugar beets. It is supplied either as dried flakes or ...

and

flax Flax, also known as common flax or linseed, is a flowering plant, ''Linum usitatissimum'', in the family Linaceae. It is cultivated as a food and fiber crop in regions of the world with temperate climates. Textiles made from flax are known in ...

seed should be included within senior dog foods to help improve stool quality and prevent

constipation Constipation is a bowel dysfunction that makes bowel movements infrequent or hard to pass. The stool is often hard and dry. Other symptoms may include abdominal pain, bloating, and feeling as if one has not completely passed the bowel movement ...

. A current technology that is being used to improve gastrointestinal health of aging dogs is the addition of fructooligosacchardies and mannanoligosaccharides. These

oligosaccharide An oligosaccharide (/ˌɑlɪgoʊˈsækəˌɹaɪd/; from the Greek ὀλίγος ''olígos'', "a few", and σάκχαρ ''sácchar'', "sugar") is a saccharide polymer containing a small number (typically two to ten) of monosaccharides (simple sugar ...

s are used in combination to improve the beneficial gut

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among ...

while eliminating the harmful gut bacteria. The aging dog goes through changes in

brain A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as vision. It is the most complex organ in a v ...

and

cognitive Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, thought, ...

health. There are two highly important ingredients that can be included in senior dog foods to help prevent cognitive decline and improve brain health. These ingredients are

vitamin E Vitamin E is a group of eight fat soluble compounds that include four tocopherols and four tocotrienols. Vitamin E deficiency, which is rare and usually due to an underlying problem with digesting dietary fat rather than from a diet low in vitami ...

and

L-carnitine Carnitine is a quaternary ammonium compound involved in metabolism in most mammals, plants, and some bacteria. In support of energy metabolism, carnitine transports long-chain fatty acids into mitochondria to be oxidized for energy production, an ...

. Vitamin E acts as an

antioxidant Antioxidants are compounds that inhibit oxidation, a chemical reaction that can produce free radicals. This can lead to polymerization and other chain reactions. They are frequently added to industrial products, such as fuels and lubricant ...

, which can prevent oxidative damage that occurs during aging. L-carnitine is used to improve

mitochondria A mitochondrion (; ) is an organelle found in the Cell (biology), cells of most Eukaryotes, such as animals, plants and Fungus, fungi. Mitochondria have a double lipid bilayer, membrane structure and use aerobic respiration to generate adenosi ...

l function, which can also help to prevent and lower rates of

oxidative damage Oxidative stress reflects an imbalance between the systemic manifestation of reactive oxygen species and a biological system's ability to readily detoxify the reactive intermediates or to repair the resulting damage. Disturbances in the normal r ...

Skin Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation. Other cuticle, animal coverings, such as the arthropod exoskeleton, have diffe ...

and coat health is important in all dogs, but especially becomes important as dogs age. An important

nutrient A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excret ...

to look for in senior dog foods to support coat health is

linoleic acid Linoleic acid (LA) is an organic compound with the formula COOH(CH2)7CH=CHCH2CH=CH(CH2)4CH3. Both alkene groups are cis-trans isomerism, ''cis''. It is a fatty acid sometimes denoted 18:2 (n-6) or 18:2 ''cis''-9,12. A linoleate is a salt (chem ...

, which can be found in

corn Maize ( ; ''Zea mays'' subsp. ''mays'', from es, maíz after tnq, mahiz), also known as corn (North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. Th ...

and

soybean oil Soybean oil (British English: soyabean oil) is a vegetable oil extracted from the seeds of the soybean (''Glycine max''). It is one of the most widely consumed cooking oils and the second most consumed vegetable oil. As a drying oil, processed so ...

. Another important nutrient is

vitamin A Vitamin A is a fat-soluble vitamin and an essential nutrient for humans. It is a group of organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin A carotenoids (most notably bet ...

, which helps with keratinization of hair. Good sources of vitamin A for skin and coat health include

egg yolk Among animals which produce eggs, the yolk (; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo. Some types of egg contain no yolk, for example bec ...

and

liver The liver is a major Organ (anatomy), organ only found in vertebrates which performs many essential biological functions such as detoxification of the organism, and the Protein biosynthesis, synthesis of proteins and biochemicals necessary for ...

Immune system The immune system is a network of biological processes that protects an organism from diseases. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinte ...

health has been shown to decline in aging dogs. The ratio of

omega-6 Omega-6 fatty acids (also referred to as ω-6 fatty acids or ''n''-6 fatty acids) are a family of polyunsaturated fatty acids that have in common a final carbon-carbon double bond in the ''n''-6 position, that is, the sixth bond, counting from ...

omega-3 Omega−3 fatty acids, also called Omega-3 oils, ω−3 fatty acids or ''n''−3 fatty acids, are polyunsaturated fatty acids (PUFAs) characterized by the presence of a double bond, three atoms away from the terminal methyl group in their chem ...

fatty acids plays an important role in providing optimal health. Vitamin E can be used as an antioxidant in senior dog foods. Pre- and probiotics can also be added to senior dog foods to help improve the beneficial bacteria in the gut, providing support for the immune system.

Low-protein

According to The Association of American Feed Control Officials (AAFCO) nutrient guideline for cats and dogs, the minimum

requirement for dogs during adult maintenance is 18% on a

dry matter The dry matter or dry weight is a measurement of the mass of something when completely dried. Analysis of food The dry matter of plant and animal material consists of all its constituents excluding water. The dry matter of food includes carboh ...

(DM) basis. Other parts of the world would have a guideline similar to AAFCO. The European Pet Food Federation (FEDIAF) also stated a minimum of 18%. AAFCO only provided a minimum, but majority of the diets found on the market contain a protein level exceeding the minimum. Some diets have a protein level lower than others (such as 18-20%). These low-protein diets would not be seen with growth and

reproductive The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are als ...

life stages because of their higher demand for protein, as such, these diets are for dogs meeting maintenance levels. They can be purchased, such as vegetarian, vegan, weight control, and

senior Senior (shortened as Sr.) means "the elder" in Latin and is often used as a suffix for the elder of two or more people in the same family with the same given name, usually a parent or grandparent. It may also refer to: * Senior (name), a surname ...

diets. Furthermore, this protein requirement varies from species to species.

Disadvantages

There is an increasing risk of the practice of

coprophagy Coprophagia () or coprophagy () is the consumption of feces. The word is derived from the grc, κόπρος , "feces" and , "to eat". Coprophagy refers to many kinds of feces-eating, including eating feces of other species (heterospecifics), of ...

when providing low-protein diets to dogs; a negative correlation exists between the amount of protein fed and the occurrence of coprophagy. Maintenance needs should still be met by low-protein diets, and the muscle turnover (i.e. synthesis and breakdown) will also remain at an optimal rate, as long as the

amino acid Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although hundreds of amino acids exist in nature, by far the most important are the alpha-amino acids, which comprise proteins. Only 22 alpha am ...

intake remains balanced and there are no limiting amino acids. There is a greater opportunity for amino acids to balance in diets containing more protein.

Advantages

The dog's simple

gastrointestinal tract The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organ (biology), organs of the digestive syste ...

contains a vast array of microbial populations; some members of this very diversified community include

Fusobacteriota Fusobacteriota are obligately anaerobic non-sporeforming Gram-negative bacilli. Since the first reports in the late nineteenth century, various names have been applied to these organisms, sometimes with the same name being applied to different s ...

Pseudomonadota Pseudomonadota (synonym Proteobacteria) is a major phylum of Gram-negative bacteria. The renaming of phyla in 2021 remains controversial among microbiologists, many of whom continue to use the earlier names of long standing in the literature. The ...

, and

Actinomycetota The ''Actinomycetota'' (or ''Actinobacteria'') are a phylum of all gram-positive bacteria. They can be terrestrial or aquatic. They are of great economic importance to humans because agriculture and forests depend on their contributions to soi ...

. The gut microbiota of the dog will be comparable to that of the owners due to similar environmental impacts. Not only are the microbes influenced by the dog's environment, but they are also affected by the macronutrient content of the dog's diet. The populations present and health status of the microbiota found within the gut can alter the physiological and metabolic functions of the dog, which then subsequently affects susceptibility to disease development.

Fermentation Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen. In food ...

and digestion in the

hindgut The hindgut (or epigaster) is the posterior ( caudal) part of the alimentary canal. In mammals, it includes the distal one third of the transverse colon and the splenic flexure, the descending colon, sigmoid colon and up to the ano-rectal juncti ...

of a dog can potentially be improved depending on the source and the concentration of protein provide in a diet. Greater

due to higher quality ingredients, in addition to lower protein concentrations within a diet, will help promote beneficial outcomes in assisting the health of a dog's gastrointestinal tract. Higher protein entering the gut will lead to more

putrefaction Putrefaction is the fifth stage of death, following pallor mortis, algor mortis, rigor mortis, and livor mortis. This process references the breaking down of a body of an animal, such as a human, post-mortem. In broad terms, it can be viewed ...

that give rise to various

toxin A toxin is a naturally occurring organic poison produced by metabolic activities of living cells or organisms. Toxins occur especially as a protein or conjugated protein. The term toxin was first used by organic chemist Ludwig Brieger (1849– ...

s including

carcinogen A carcinogen is any substance, radionuclide, or radiation that promotes carcinogenesis (the formation of cancer). This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes. Several radioactive substan ...

s and increase the chances of many bowel diseases, such as

colorectal cancer Colorectal cancer (CRC), also known as bowel cancer, colon cancer, or rectal cancer, is the development of cancer from the colon or rectum (parts of the large intestine). Signs and symptoms may include blood in the stool, a change in bowel m ...

. The age of dogs and cats is inversely proportional to protein consumption. As they age, the protein requirement decreases due to lower level of

pepsin Pepsin is an endopeptidase that breaks down proteins into smaller peptides. It is produced in the gastric chief cells of the stomach lining and is one of the main digestive enzymes in the digestive systems of humans and many other animals, w ...

in their stomachs. There has also been discussion about higher protein content in diets being inversely related with lifespan (i.e.

negative relationship In statistics, there is a negative relationship or inverse relationship between two variables if higher values of one variable tend to be associated with lower values of the other. A negative relationship between two variables usually implies that ...

), where lower protein content diets were related to longer lifespans.

Hypoallergenic

Dogs are prone to have adverse allergic reactions to food similar to human beings. The most common symptoms of food allergies in dogs include rashes, swelling, itchy or tender skin, and gastrointestinal upsets such as uncontrollable bowel movements and soft stools. Certain ingredients in dog food can elicit these allergic reactions. Specifically, the reactions are understood to be initiated by the protein ingredients in dog food, with sources such as beef, chicken, soy, and turkey being common causes of these allergic reactions. A number of "novel protein" dog foods are available that claim to alleviate such allergies in dogs.

Hypoallergenic Hypoallergenic, meaning "below average" or "slightly" allergenic, is a term meaning that something (usually cosmetics, pets, textiles, food, etc.) causes fewer allergic reactions. The term was first used in 1953 in an advertising campaign for cosm ...

diets for dogs with food allergies consist of either limited ingredients, novel proteins, or hydrolyzed proteins. Limited ingredients make it possible to identify the suspected allergens causing these allergic reactions, as well as making it easy to avoid multiple ingredients if a canine is allergic to more than one. In novel protein recipes, manufacturers use ingredients which are less likely to cause allergic reactions in dogs such as lamb, fish, and rice. Hydrolyzed proteins do not come from a novel source; they could originate from chicken or soy for example. Hydrolyzed proteins become novel when they are broken apart into unrecognizable versions of themselves, making them novel to allergic gastrointestinal tracts.

Grain-free and low-carbohydrate

Some dog food products differentiate themselves as grain- or carbohydrate-free to offer the consumer an alternative, claiming carbohydrates in pet foods to be fillers with little or no nutritional value. A study published in ''

Nature Nature, in the broadest sense, is the physics, physical world or universe. "Nature" can refer to the phenomenon, phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. ...

'' suggests that domestic dogs' ability to easily metabolize carbohydrates may be a key difference between wolves and dogs. Some consumers and manufacturers say dogs perform better on grain-free diets, while some veterinarians doubt this for a lack of scientific evidence. In 2019, a study comparing dry dog food that was manufactured in the United States found that 75% of food containing feed grade grains also contained measurable levels of various mycotoxins (discussed below), while none of the grain-free dry diets tested had any detectable levels of mycotoxins. Feed grade (lower quality grade) grains that are allowed to spoil and become moldy are the suspected source of the mycotoxins. This is the first published study to show a potential health benefit to feeding grain-free commercial dry pet foods. In 2019, the U.S. Food and Drug Administration identified 16 dog food brands linked to canine heart disease. The FDA has investigated more than 500 cases of

dilated cardiomyopathy Dilated cardiomyopathy (DCM) is a condition in which the heart becomes enlarged and cannot pump blood effectively. Symptoms vary from none to feeling tired, leg swelling, and shortness of breath. It may also result in chest pain or fainting. Co ...

in dogs eating food marketed as grain-free. The 16 brands are: Acana, Zignature, Taste of the Wild, 4Health, Earthborn Holistic, Blue Buffalo, Nature's Domain, Fromm, Merrick, California Natural, Natural Balance, Orijen,

Nature's Variety Nature's Variety is a pet food company, wholly owned by Barcelona, Barcelona, Spain–based Agrolimen. With manufacturing facilities in Lincoln, Nebraska, and headquarters in St. Louis, Missouri, Nature's Variety specializes in natural, raw, an ...

, NutriSource, Nutro, and Rachael Ray Nutrish. These brands are labeled as "grain-free" and list peas, lentils, or potatoes as the main ingredient. The top three brands associated with reports of cardiomyopathy are Acana with 67 reports, Zignature with 64, and Taste of the Wild with 53 reports.

Vegetarian and vegan

Like the

human Humans (''Homo sapiens'') are the most abundant and widespread species of primate, characterized by bipedalism and exceptional cognitive skills due to a large and complex brain. This has enabled the development of advanced tools, culture, ...

practice of

veganism Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. ...

, vegan dog foods are those formulated with the exclusion of

ingredient An ingredient is a substance that forms part of a mixture (in a general sense). For example, in cooking, recipes specify which ingredients are used to prepare a specific dish. Many commercial product (business), products contain secret ingredie ...

s that contain or were processed with any part of an

animal Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motilit ...

, or any animal byproduct. The

omnivorous An omnivore () is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize the nutri ...

domestic canine has evolved to metabolize

carbohydrate In organic chemistry, a carbohydrate () is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula (where ''m'' may or ma ...

s and thrive on a diet lower in

, and therefore, a vegan diet may be substantial if properly formulated and balanced. Popularity of this diet has grown with a corresponding increase in people practicing

vegetarianism Vegetarianism is the practice of abstaining from the consumption of meat (red meat, poultry, seafood, insects, and the flesh of any other animal). It may also include abstaining from eating all by-products of animal slaughter. Vegetarianism may ...

and

, and there are now various commercial vegetarian and vegan diets available on the market. Vegetarian dog foods are produced to either assuage a pet owner's ethical concerns or for animals with extreme allergies. Due to the exclusion of animal products and by-products, which are primary ingredients of conventional dog food, many nutrients that would otherwise be provided by animal products need to be provided by replacement, plant-based ingredients. While both animal and plant products offer a wide range of macro and

micronutrients Micronutrients are nutrient, essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain health. Micronutrient requirements differ between organisms; for exam ...

, strategic formulation of plant ingredients should be considered to meet nutritional requirements, as different nutrients are more abundant in different plant sources. Despite the large differences in ingredient sourcing, studies have demonstrated that a plant-based diet can be just as edible and

palatable Palatability (or palatableness) is the hedonic reward (i.e., pleasure) provided by foods or fluids that are agreeable to the "palate", which often varies relative to the homeostatic satisfaction of nutritional, water, or energy needs. The palatabi ...

as animal-based diets for dogs. Some nutrients that require special consideration include protein, calcium, vitamin D, vitamin B12, taurine, L-carnitine, and omega-3 fatty acids, particularly DHA and EPA. Although their sources are more limited without animal products, it is possible to formulate a diet adequate in these nutrients through plant and synthetic sources. Potential risks in feeding a plant-based diet include alkaline urine and nutrient inadequacy, especially in homemade diets. Adherence to recommendations by reliable sources is strongly advised.

Nutrients and supplements

The requirements and functions of nutrients in dogs are largely similar to those in cats, with many requirements relaxed: * The requirement of

arginine Arginine is the amino acid with the formula (H2N)(HN)CN(H)(CH2)3CH(NH2)CO2H. The molecule features a guanidino group appended to a standard amino acid framework. At physiological pH, the carboxylic acid is deprotonated (−CO2−) and both the am ...

in the

urea cycle The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea (NH2)2CO from ammonia (NH3). Animals that use this cycle, mainly amphibians and mammals, are called ureotelic. The urea cycle converts highl ...

is reduced, as dogs have a functional

pyrroline-5-carboxylate synthase Delta-1-pyrroline-5-carboxylate synthetase (P5CS) is an enzyme that in humans is encoded by the ''ALDH18A1'' gene. This gene is a member of the aldehyde dehydrogenase family and encodes a bifunctional ATP- and NADPH-dependent mitochondrial enzy ...

. * Dogs have a functional

delta 6 desaturase In enzymology, a linoleoyl-CoA desaturase (also Delta 6 desaturase, ) is an enzyme that converts between types of fatty acids, which are essential nutrients in the human body. The enzyme mainly catalyzes the chemical reaction :linoleoyl-CoA + A ...

, hence no specific need for

arachidonic acid Arachidonic acid (AA, sometimes ARA) is a polyunsaturated omega-6 fatty acid 20:4(ω-6), or 20:4(5,8,11,14). It is structurally related to the saturated arachidic acid found in cupuaçu butter. Its name derives from the New Latin word ''arachi ...

. * Dogs have a functional

sulfinoalanine decarboxylase The enzyme sulfinoalanine decarboxylase () catalyzes the chemical reaction :3-sulfino-L-alanine \rightleftharpoons hypotaurine + CO2 Hence, this enzyme has one substrate, 3-sulfino-L-alanine (also known as Cysteine sulfinic acid), and two produ ...

, hence no need for

taurine Taurine (), or 2-aminoethanesulfonic acid, is an organic compound that is widely distributed in animal tissues. It is a major constituent of bile and can be found in the large intestine, and accounts for up to 0.1% of total human body weight. It ...

. * Unlike cats, dogs and humans can use

Vitamin D2 Ergocalciferol, also known as vitamin D2 and nonspecifically calciferol, is a type of vitamin D found in food and used as a dietary supplement. As a supplement it is used to prevent and treat vitamin D deficiency. This includes vitamin D defici ...

nearly as efficiently as they use

Vitamin D3 Cholecalciferol, also known as vitamin D3 and colecalciferol, is a type of vitamin D that is made by the skin when exposed to sunlight; it is found in some foods and can be taken as a dietary supplement. Cholecalciferol is made in the skin f ...

Chart

The European Union does not use a unified nutrient requirement. A manufacturer committee called FEDIAF (European Pet Food Industry Federation) makes recommendations for cats and dogs that members follow. Both AAFCO and FEDIAF publish in two formats: one in the amount-per-kilogram form above, another in an energy-ratio format.

Dangers

A number of common human foods and household ingestibles are

toxic Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a subst ...

to dogs, including chocolate solids (

theobromine poisoning Theobromine poisoning, also informally called chocolate poisoning or cocoa poisoning, is an overdosage reaction to the xanthine alkaloid theobromine, found in chocolate, tea, cola beverages, and some other foods. Sources Cocoa powder contains ...

onion An onion (''Allium cepa'' L., from Latin ''cepa'' meaning "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus ''Allium''. The shallot is a botanical variety of the onion ...

and

garlic Garlic (''Allium sativum'') is a species of bulbous flowering plant in the genus ''Allium''. Its close relatives include the onion, shallot, leek, chive, Allium fistulosum, Welsh onion and Allium chinense, Chinese onion. It is native to South A ...

(

thiosulfate Thiosulfate ( IUPAC-recommended spelling; sometimes thiosulphate in British English) is an oxyanion of sulfur with the chemical formula . Thiosulfate also refers to the compounds containing this anion, which are the salts of thiosulfuric acid, ...

alliin Alliin is a sulfoxide that is a natural constituent of fresh garlic. It is a derivative of the amino acid cysteine. When fresh garlic is chopped or crushed, the enzyme alliinase converts alliin into allicin, which is responsible for the aroma of ...

or allyl propyl disulfide poisoning),

grape A grape is a fruit, botanically a berry, of the deciduous woody vines of the flowering plant genus ''Vitis''. Grapes are a non- climacteric type of fruit, generally occurring in clusters. The cultivation of grapes began perhaps 8,000 years ago, ...

s and

raisin A raisin is a dried grape. Raisins are produced in many regions of the world and may be eaten raw or used in cooking, baking, and brewing. In the United Kingdom, Ireland, New Zealand, and Australia, the word ''raisin'' is reserved for the d ...

s (cause

kidney failure Kidney failure, also known as end-stage kidney disease, is a medical condition in which the kidneys can no longer adequately filter waste products from the blood, functioning at less than 15% of normal levels. Kidney failure is classified as eit ...

in dogs),

milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digestion, digest solid food. Immune factors and immune ...

(some dogs are lactose intolerant and suffer diarrhea; goats' milk can be beneficial to dogs),

mushroom A mushroom or toadstool is the fleshy, spore-bearing fruiting body of a fungus, typically produced above ground, on soil, or on its food source. ''Toadstool'' generally denotes one poisonous to humans. The standard for the name "mushroom" is t ...

s, fatty foods,

rhubarb Rhubarb is the fleshy, edible stalks ( petioles) of species and hybrids (culinary rhubarb) of ''Rheum'' in the family Polygonaceae, which are cooked and used for food. The whole plant – a herbaceous perennial growing from short, thick rhizo ...

xylitol Xylitol is a chemical compound with the formula , or HO(CH2)(CHOH)3(CH2)OH; specifically, one particular stereoisomer with that structural formula. It is a colorless or white crystalline solid that is freely soluble in water. It can be classifie ...

macadamia nut ''Macadamia'' is a genus of four species of trees in the flowering plant family Proteaceae. They are indigenous to Australia, native to northeastern New South Wales and central and southeastern Queensland specifically. Two species of the genus ...

s, as well as various plants and other potentially ingested materials. A full list of poison/toxic substances can be found on the ASPCA's website.

Recalls

The 2007 pet food recalls involved the massive

recall Recall may refer to: * Recall (bugle call), a signal to stop * Recall (information retrieval), a statistical measure * ''ReCALL'' (journal), an academic journal about computer-assisted language learning * Recall (memory) * ''Recall'' (Overwatch ...

of many brands of

and

foods beginning in March 2007. The recalls came in response to reports of

renal failure Kidney failure, also known as end-stage kidney disease, is a medical condition in which the kidneys can no longer adequately filter waste products from the blood, functioning at less than 15% of normal levels. Kidney failure is classified as eit ...

in pets consuming mostly wet pet foods made with wheat gluten from a single

Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of va ...

company, beginning in February 2007. After more than three weeks of complaints from consumers, the recall began voluntarily with the

Canadian Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...

company

Menu Foods Menu Foods Limited, based in Streetsville in Mississauga, Ontario, Canada, was the largest maker of wet cat and dog food in North America, with its products sold under 95 brand names, which the company identifies as supermarkets, big box and pet p ...

on March 16, 2007, when a company test showed sickness and death in some of the test animals. Overall, several major companies recalled more than 100 brands of pet foods, with most of the recalled product coming from Menu Foods. The contaminant was identified as

melamine Melamine is an organic compound with the formula C3H6N6. This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due t ...

, which had been added as an adulterant to simulate a higher protein content. In the United States, there has been extensive media coverage of the recall. There have been calls for

government regulation Regulation is the management of complex systems according to a set of rules and trends. In systems theory, these types of rules exist in various fields of biology and society, but the term has slightly different meanings according to context. For ...

of pet foods, which had previously been self-regulated by pet food manufacturers. The economic impact on the pet food market has been extensive, with Menu Foods losing roughly $30 million alone from the recall.

Contaminants

Mycotoxins

In April 2014,

aflatoxin B1 Aflatoxin B1 is an aflatoxin produced by ''Aspergillus flavus'' and '' A. parasiticus''. It is a very potent carcinogen with a TD50 3.2 μg/kg/day in rats. This carcinogenic potency varies across species with some, such as rats and monkeys, seem ...

, a known carcinogenic toxin, melamine, and

cyanuric acid Cyanuric acid or 1,3,5-triazine-2,4,6-triol is a chemical compound with the formula (CNOH)3. Like many industrially useful chemicals, this triazine has many synonyms. This white, odorless solid finds use as a precursor or a component of bleaches ...

were all found in various brands of USA pet food imported into Hong Kong. Since 1993, the FDA has confirmed concerns of toxins in feed grade (animal grade) ingredients, yet to date no comprehensive federal regulation exists on mycotoxin testing in feed grade (animal grade) ingredients used to make pet food. In 1997, the ''Journal of Food Additives and Contaminants'' established that low levels of various mycotoxins could cause health concerns in pets, and was found in feed grade ingredients. A study published in the ''Journal of Food Protection'' in 2001 cited concerns regarding fungi (the source of mycotoxins) in commercial pet foods and warned about the "risk for animal health". In 2006, a study published in the ''Journal of Agricultural and Food Chemistry'' confirmed mycotoxins in pet foods around the world and concluded that contamination of mycotoxins in pet foods can lead to chronic effects on the health of pets. In 2007, the ''International Journal of Food Microbiology'' published a study that claimed "mycotoxin contamination in pet food poses a serious health threat to pets", and listed them: aflatoxins, ochratoxins, trichothecenes,

zearalenone Zearalenone (ZEN), also known as RAL and F-2 mycotoxin, is a potent estrogenic metabolite produced by some ''Fusarium'' and ''Gibberella'' species. Specifically, the ''Gibberella zeae ,'' the fungal species where zearalenone was initially detected ...

, fumonisins and fusaric acid. A 2008 study published in the ''Journal of Animal Physiology and Animal Nutrition'' found high levels of mycotoxins in the raw ingredients used for pet food in Brazil. A 2010 study in the ''Journal of Mycotoxin Research'' tested 26 commercial dog foods and found mycotoxins at concerning sub-lethal levels. It was determined that long-term exposure to low levels of confirmed mycotoxins could pose chronic health risks. For all the above reasons, a trend away from feed ingredients and toward USDA-certified ingredients fit for human consumption has developed. In 1999, another fungal toxin triggered the recall of dry dog food made by Doane Pet Care at one of its plants, including Ol' Roy,

Wal-Mart Walmart Inc. (; formerly Wal-Mart Stores, Inc.) is an American multinational retail corporation that operates a chain of hypermarkets (also called supercenters), discount department stores, and grocery stores from the United States, headquarter ...

's brand, as well as 53 other brands. This time the toxin killed 25 dogs. A 2005 consumer alert was released for contaminated Diamond Pet Foods for dogs and cats. Over 100 canine deaths and at least one feline fatality have been linked to Diamond Pet Foods contaminated by potentially deadly aflatoxin, according to Cornell University veterinarians.

''Salmonella'' and copper

The FDA released a video focusing on another major threat in commercial pet food: ''Salmonella'' bacterial contamination. They also cite other major toxins of concern. The video references the case of a specific commercial pet food plant that was also the subject of a March 2014 study published in the ''Journal of the American Veterinary Medical Association''. It details how at least 53 known human illnesses were linked to commercial pet foods made at that plant in 2012. A class action lawsuit linked to this outbreak was settled in 2014. The video also cites the dangers of over supplementation of nutrients in pet food. A study published in the ''Journal of the American Veterinary Medical Association'' in February 2013 suggested a correlation between liver disease and the amount of copper supplementation in AAFCO diets.

In popular culture

Eating your own dog food Eating your own dog food or "dogfooding" is the practice of using one's own products or services. This can be a way for an organization to test its products in real-world usage using product management techniques. Hence dogfooding can act as qual ...

or dogfooding is the practice of using your own products or services.

References

External links

Interpreting pet food labels
– Pet food labeling according to

AAFCO The Association of American Feed Control Officials (AAFCO) is a non-profit organization which sets standards for the quality and safety of animal feed (fodder) and pet food in the United States. AAFCO is a voluntary organization consisting largely ...

regulations * {{DEFAULTSORT:Dog Food Pet foods Dog nutrition

History

Commercial varieties

Dry

Manufacturing process

Wet

Manufacturing process

Semi-moist

Dehydrated and freeze-dried

Contents

Quality, digestibility and energy density

Labeling

Types of diets

Raw

Senior

Low-protein

Disadvantages

Advantages

Hypoallergenic

Grain-free and low-carbohydrate

Vegetarian and vegan

Nutrients and supplements

Chart

Dangers

Recalls

Contaminants

Mycotoxins

''Salmonella'' and copper

In popular culture

See also

References

External links