ive had alot of pure breed pits and mixes and they were very protective over me and my family but very playful. any dog can kill something and its because its the way it was raised. my one pit candy my family rescued her and she was so protective and didnt allow anyone in the yard or around us, unless she has seen them before and knows them. and Maxine we got her as a baby and she grew up to be playful and could be around anyone just how they are raised.