i let my boss' mal knox bite me once, and it didn't hurt or scare me bc i'm a little girl and when he bit the sleeve (and he's fully trained, very serious) his pulling on it pulled my arm to the back of the sleeve away from the bitebar so i didn't even feel the bite. it was actually really cool, but you realize how powerful these animals are, and knox is a NICE mal, but he's no super muscular pitbull, i can't imagine taking a hit or a bite from one of them!
i have a neopolitan mastiff that's starting protection at my school, i'll have to take pics! his name is sully, and he's a lover! but he will kill you if he has to!