Mine is protective, he is a pet, but no-one would be able to get to me if he takes a dislike to them, I have had to grab him, running full pelt past me, as there was someone the other side who he didn't like, sometimes he gets that everyone but me is easy game, but he has never tried to bite me yet, when I was dealing with a dog fight once, he came in and tried to start on the dog who was then biting me, he is 3/4 Grey 1/4 GSD, but the only GSD looks he has are his ears lol, he is trainable when he wants to be, but when someone else is doing the training even things that he knows he will test