JoJo is an amer staff, she doesn't bite, she slaps, she has gotten into fights and ended up in situations where she protected me and our house, but she has neer bit a person or another dog, she just wrestles them down and uses that growl she has, and keeps the person or dog on the ground until my hubby, my best friend or I call her off. She is rougher than my other 2 dogs at play, but she still has never bit, even when put in a situation where most would.