A buddy used to have a German Shepard that did something similar. If you went up to her and started pushing her around or play "rough", she'd bare her teeth and start growling. But she'd never actually bite you. It was always fun doing that when a new person came over as it would scare the hell out of them. "WHAT THE ARE YOU DOING? That dogs gonna friggen kill you!"Every time he or Mitchell does that, I ROTFLMAO. One would think their dog would take your hand off.