what age is the limit for breeding a dog
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.
A female dog, (bitch) can begin puberty around 6 months of age. If she has not had her first heat, or cycle, by 12 months of age, talk to your vet. The bitch will typically come into heat twice a year after her first heat.