There is no problem in mating your dog with a male dog of any age. If the male dog can do it, then it is done. Does NOT matter the age of any dog. Concider this, if the dog was in the wild would the dog breed? Would there be problems? problems come up in life for good reasons. Dogs die, pups die... that is life. wild animals do not have a human there to SAVE THEM.. there fore the strong survive and all problem dogs/pups die. If you allow weak to die, you beget only healthy. Now, about the prodigy... research dominant recesive, you will find that large is recessive and small and thin is dominate. long muzzles are dominate over short. Med is usual. long legs dominate over short. erect ears dom over drop. Lois Schwarz.