what's up buddy?
some interesting clues
to breed (verb)
breeder-> one who breeds
some example of breeds-> Labrador Retriever, Golden Retriver etc
to whelp-> to give birth to puppies (for eg.)
litter-> lots of puppies/cats just whelped from a dog/cat
another important point is that if you also want to say what breed is he? (to male dogs/ stud dogs) or even what breed is she? (to female dogs/bitches)
that's also correct.
by the way..
I'm a breeder..