how old does a dog have to be to breed?
<answer> A male dog can mate when he's 6 months and older. For females, it's best to wait until they are 2 years old. <context> A male dog can mate when he's 6 months and older. For females, it's best to wait until they are 2 years old. That way there is less of a chance of miscarrage and she'll have m … ore time to mature and be physically ready for puppies.