I agree, this whole " thing" with this " locking" jaw, it's a crock! A pitty has no way of doing so, it's not made any diff to other breeds in the jaw, they r a dog, just like other K9's. My first reg dog was a amarican papered pitty and I keep cattle dogs and kelpies now and I know witch breed is more Likly to bite and it's NOT the pitty. My 2 yo would sit on my pitty like a horse, I wouldn't dream of letting a kid do that to some breeds, ( only due to some breeds don't have the tollerance) So many little breeds get away with bad manners!!!