It's good that he gave a warning growl and that he did not bite. I once read that if a dog wants to bite, they will bite, so if they snap and miss, it was because they meant to miss, so although it's not good that they snapped, it is good that they know to make it a miss know what I mean? it sounds like you handled the situation well. As others said, I'd take away couch privileges right now, make sure your son respects Parker's space when he's sleeping, and that they are always supervised together. Also, maybe have your son do some obedience training with Parker (sit, down, stay with treat