Last night I was trying to get something that was stuck in Gizmo's hair out. It wasn't hurting him and *I* wasn't hurting him but every time I tried to get at it he viciously bit me (we're not talking their regular nips here, he BIT HARD). I don't want this behaviour to continue because if I take him to a groomer he might do that to them and then I'm in trouble. PLEASE help me... I don't know what to do!