My sisters dog pain is a pitbull and they tried mating them with his sister. He had a litter but they all died. The vet said they didnt have proper vet care. When they retry to breed pain with his sister they are going to go to a vet. That made me so mad because the ignorance of people and the willingness to save a few bucks and not get proper care for the animals. I say unless you are a certified veternarian you should always see a vet. It might save your pet or your pets litter.