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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. Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle.
A male dog, (stud) can go through puberty between 5 and 12 months of age. If your dog has not reached sexual maturity by 12 months, talk to your vet. The age varies by breed with smaller dogs maturing earlier than larger breeds.A male can be sexually viable as early as 5 months.Watch your puppy around females in heat to prevent copulation.KC requires that your dog be less than 12 years old to register a litter. I think that a bitch should be retired by 8 years old at the latest, optimally around 5 years of age. Every dog is different, so you should talk with your vet about your dogsâ health and age. A stud is really never TOO old to copulate.