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Canine reproduction is the process of sexual reproduction in domestic dogswolvescoyotes and other canine species. 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.

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 bitch "Tie" for some time after ejaculation typically between 15 and 30 min. This increases the chance of fertilisation and prevents, albeit for a short time, other suites from mating with a particular female. Behind the knot the penis is very flexible in the horizontal direction allowing the male to unmount while remaining tied.

The shaft of a dogs penis is not visible, even during an erection; however its pathway can be felt starting at the knot passing between the hind legs and carrying on up to the anus. Inside the corpus spongiosum lies the baculum.

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This allows the male dog to enter into the vagina before the erectile tissue is swollen. The urethra is located inside of a downward facing groove on the baculum and ends at the tip of the penis urethral process. During an erection a small dip just above the urethral process can be seen. This is because the skin at the tip of the penis is connected via cartilage to the baculum. When the erectile tissue swells, the size of the baculum and connective tissue remains constant, pulling back the skin at the tip. The penile sheath entirely surrounds the glans while not erect.

The back part is intergrown with the abdominal skin.

The front part, almost reaching to the navelis free. The inner sheath, just like the glans, is covered with a mucous membrane and the outer sheath is covered with normal, hairy epidermis.

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In domestic dogs, sexual maturity puberty occurs between the ages of 6 to 12 months for both males and females, although this can be delayed until up to two years of age for some large breeds. The average length of the reproductive cycle for females is 2—4 weeks. Females reach sexual maturity puberty between 8 and 18 months of age.

There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. Proestrusin which eggs in the ovaries begin to mature and estrogen levels begin to rise, is the first stage of the reproductive cycle. During this stage females, though non-receptive, attract males.

Initial changes include swelling of the vulva lips, which become pliable, small amounts of bloody vaginal discharge, frequent urination, and s of restlessness. Proestrus generally lasts nine days.

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Estrus follows, in which estrogen levels are high, mature eggs are released from both ovaries, and females become receptive both physically and mentally to copulation. Only during estrus will copulation result in pregnancy. During proestrus and estrus, females may have a clear, blood tinged, or bloody discharge.

Dogs during these stages are often informally referred to as being in heat. The length of these cycles varies greatly among breeds and even between individuals of the same breed. Proestrus and estrus can last anywhere from 5 days to 21 days. Diestrus is the period following mating.

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Diestrus lasts approximately 56 to 60 days in a pregnant female, and 60 to days in a non-pregnant female. During both of these periods, progesterone levels are high. Because the hormonal profile of a pregnant female and a female in diestrus are the same, sometimes a non-pregnant female will go through a period of pseudo-pregnancy. At that time she may gain weight, have mammary gland developmentproduce milk, and exhibit nesting behaviours. Anestrus is the remaining period, the time of reproductive quiescence. The female has no attraction to mating. Anestrus generally lasts four to five months.

As with most tetrapodscanine copulation involves the male mounting the female from behind, a position that is colloquially referred to as " doggy style " but does not have a specifically known origin. When a male canine is interested in mounting a female, he will sniff the female's vulva. If the female is receptive, she will stand still and hold her tail to the side, a stance referred to as "flagging".

Unlike human sexual intercourse, where the male penis commonly becomes erect before entering the female, canine copulation involves the male first penetrating the dog, after which swelling of the penis to erection occurs, which usually happens rapidly. Male canines are the only animals that have a locking bulbus glandis or "bulb", a spherical area of erectile tissue at the base of the penis. While characteristic of mating in most canids, the copulatory tie has been reported to be absent [12] or very brief less than one minute [13] in the African wild dogpossibly due to the abundance of large predators in its environment.

When the penis is locked into the vagina by the bulbus glandis when the stud is "tied"thrusting behavior stops and the male will usually lift a leg and swing it over the female's back while turning around. The two stand with their hind ends touching and the penis locked inside the dick while ejaculation occurs, decreasing leakage of semen from the vagina.

Virgin dogs can become quite distressed at finding themselves unable to separate during their first copulation, and may try to with away or run. Dog breeders often suggest it is appropriate for handlers to attempt to calm the mating dogs if they show anxiety once this stage is reached. After mating, the male usually licks his penis and prepuce. Gestation in a dog is 63 days in length, if measured from big day of ovulation. Since it is difficult to determine the exact date of ovulation, errors are often made in calculating gestation period.

If she is bred on the day the oocytes can be fertilized, her gestation length will appear to be 60 days long.

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A rule of thumb is that a mammal will produce half as many offspring as the of teats on the mother. An average litter consists of about five to six puppiesthough this may vary widely based on the breed of dog. Size of the breed is correlated with litter size. Miniature and small breeds average three to four puppies in each litter, with a maximum litter size of about 5—8. Large and giant breeds average 7 puppies per litter but can have a maximum litter size of about The of puppies also varies with the mother's age.

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In smaller breeds, both young and old age are associated with smaller litter size. In larger breeds, only old age is associated with smaller litter size. The largest litter size to date was set by a Neapolitan Mastiff in ManeaEngland on November 29, ; the litter was 24 puppies. Some breeds have been developed to emphasize certain physical traits beyond the point at which they can safely bear litters on their own.

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Litter size, breed size and age of the female is associated with increased risk. High risk breeds for stillborn includes the Dogue de Bordeaux Bernard High risk breeds for early neonatal mortality includes the Rhodesian Ridgeback Common causes of early neonatal mortality are bacteria infection, fetal asphyxia and fading puppy syndrome. Other causes may include elective euthanasia because of congenital defects or failure to meet breed standards. Other multi-breed studies have put stillborn rates at 6. On the basis of an analysis of data on 42, dachshund litters, it was found that as the inbreeding coefficient increased, litter size decreased and the percentage of stillborn puppies increased, thus indicating inbreeding depression.

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Because the African wild dog Lycaon pictus largely exists in fragmented small populations, its existence is endangered. Inbreeding avoidance via mate selection is characteristic of the species and has important potential consequences for population persistence. Computer-population simulations indicate that all populations continuing to avoid incestuous mating will become extinct within years due to the unavailability of unrelated mates.

Red wolves primarily live in packs composed of a socially monogamous breeding pair and offspring of different ages. Using long-term data on red wolf individuals of known pedigree, it was found that inbreeding among first-degree relatives was rare.

Many of the young wolves spend time alone or in small non-breeding packs composed of unrelated individuals. The union of two unrelated individuals in a new home range is the predominant pattern of breeding pair formation. Among Ethiopian wolvesmost females disperse from their natal pack at about two years of age, and some become "floaters" that may successfully immigrate into existing packs. Breeding pairs are most often unrelated to each other, suggesting that female-biased dispersal reduces inbreeding.

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