We have a new GSD he is neutered and 8 months old. We have not had him long and have 3 small dogs. He seems to like to try and bite the back of their necks. This in turn freaks out the small dogs and they growl and or bark. When playing with us he also likes to nip at the air. Im sure its normal behavior but not desireable. Im more concerned with him biting the other dogs on the neck. Is this him trying to play or is he being mean? WHen he does it he gets focused on them with his ears up but never growls or barks.