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Dogs over around 7 or 8 years are not usually considered appropriate for breeding, but can still remain fertile.

They then experience estrus about every seven months until old age.

Female dogs do not experience menopause, although their cycles will become irregular and fertility becomes unpredictable as they become older.

In canine reproduction, the female sex of the domestic canine is often referred to as a bitch, and the male of the same species is referred to as a stud. In domestic canines, 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.

Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle.[citation needed] As with other domesticated species, domestication has selectively bred for higher libido, and earlier and more frequent breeding cycles in dogs than in their wild ancestors.

At the time of penetration, the penis is not erect; it is slender and is only able to penetrate the female because of the presence of the small bone inside it, known as the baculum.

When the male achieves penetration, he will often hold the female tighter and thrust faster, and it is at this point that the male’s penis expands.

Initially, the vulva lips will swell up and become pliable, there are small amounts of bloody vaginal discharge, and signs of frequent urination and restlessness. Estrus is the next stage, in which estrogen levels are high, mature eggs are released from ovaries, and the females mentally and physically become receptive to copulation.

It is only during estrus that copulation will result in pregnancy.

In domestic dogs, one of the behaviors that is noted is the abolition of the pair bond seen in wild canines.

The ability of the female domestic dog to come into estrus at any time of the year and usually twice a year is also valued.

Females reach sexual maturity (puberty) between 8 and 18 months of age.

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