I am not claiming there is not ANY circumstance where a sound dog won't bite - I agree that sound dogs have their limits. I am simply saying that a lack of training/socialization in itself isn't going to cause a Pit Bull to bite. Pit Bulls have a MUCH higher level of tolerance than other breeds, and do not bite humans in many situations where other breeds will. It DOES take a lot more to get a sound Pit Bull to bite someone than it does say, a Golden Retriever. An unsocialized but SOUND Pit Bull should not fearfully bite something it wasn't exposed to... otherwise, it wouldn't be sound - because fearfulness is not part of the breed. Are there exceptions to everything? Of course. But Pit Bull owners/breeders have HIGH standards (responsible owners, anyways) when it comes to their dogs and how they handle interactions with humans.