Yes genetics are going to determine the ultimate outcome as far as size of pups go. In utero, however, the bitch plays a large role in how large the puppies grow inside of her. Not unlike an alligator in a fish tank. I am sure there are some circumstances where that rule is not followed, such as breeding a much larger BREED of dog, like say a 25 beagle with a 5 lb yorkie, but generally it seems, from what I have studied, the smaller males are bred to the larger females to keep the pups smaller as full grown dogs, not in utero.
__________________ Proud Mommy of Gavin, Ethan, Morgan, Nia, Olivia, and Kiana and baby #7! Also Mommy to furkids: Cleo ,Lola, Lilly Appletini, and Diesel.  and Sunny, Ethan's Golden therapy dog in training. |