What happens next?

How to know if a male dog is fertile
Make sure that your dog is old enough to breed.
A male dog that is too young will not be able to reproduce. A male dog usually reaches sexual maturity when they are over a year old, however they usually begin puberty when they are six months to eight months old.

Pick your answer from: (1). Be sure your dog is healthy enough to have a litter. The correct outcome to obtain a male dog is a dose of 3 or more viable puppies that have not yet been neutered. (2). Older dogs, like their peers, may develop fetuses or larger, serious testicles. Research the characteristics of your male dog. (3). If a female dog has had a male dog in the past, there is no guarantee that they will be able to breed. It is important to follow you specific plan. (4). They can impregnate a female dog from the point of puberty on. If you want to use your dog for breeding when it is at its maximum fertility, wait until it is at least a year and a half old.
(4).