Canine reproduction

Sexual reproduction in canine species Canine reproduction is the process of sexual reproduction in domestic dogs, wolves, coyotes and other canine species. Canine sexual anatomy and development Male reproductive system Canine male reproductive system Erectile tissue As with all mammals, a dog's penis is made up of three pieces of erectile tissue. These are the two corpora cavernosa and the singular corpus spongiosum which continues in the glans. A notable difference from the human penis is that the visible part during an erection consists entirely of the glans. The retractor muscle is attached at the shaft of the penis. It is a paired smooth muscle that is used to retract the penis back into the sheath. Glans A dog's glans consists of two sections: Behind the lower, long part (pars longa glandis) lies the "knot" (Bulbus glandis) which expands only after penetrating the vagina and causes the male dog to remain inside the female ("tie") for some time after ejaculation (typically between 5 and 20 minutes). This increases the chance of fertilisation and prevents, albeit for a short time, other suitors from mating with a particular female. Behind the knot the penis is very flexible in t