Puppy hostile from birth

My wife and I each had a dog. I fed rotten flesh to my dog, then to hers. They bred, and the resulting puppy was hostile to me. I had no choice but to kill or be killed.

This happened once, and all other breeding attempts have been successful. I haven't been able to identify what caused this or reproduce it. I suspect it will occur for other players, but on a very infrequent basis.