I have an almost 2 year old German Shepherd (male - not neutered). He is well socialized, energetic, good temperament, rough play. We just got an 8 week female German Shepherd. They get along most of the time. The 2 year old male grabs at her neck (not full bite) and nudges her alot. He definitely enjoys her company and he loves to play. However, with grabbing her neck I'm unsure if he is trying to be dominent and causing trouble. The puppy usually responds back with bites, barks and growls. At times it turns into play because the puppy goes into the play position with a high tail. And this exites him so much that he knocks her over by running at her or around her (he is 90lbs). She loves to bite at his cheeks. However, what worries me is when she starts to snarl at him because he goes for her neck. She looks crazy! She rarely submits to him and it escalates because of that. Is this normal?? Is it playing, fighting or both?