I know I've posted this in the puppy section but I want to see what people here would say. My puppy is almost 8 months and he's over teething (nipping), but everytime someone comes over to pet him, he gets excited and opens his mouth. He doesn't actually bites down or tries to hurt the person, but he holds onto the person's cloths. I didn't see any aggression but I'm concerned about it. The nipping has stopped with him but he seems to think that its okay to mouth. I never taught him how to stop bitting because I didn't know how. I yelped and redirected but yelping seems to make him more excited. What do I do when strangers are coming to pet him? Is this normal?