Hello! Our puppy is just 4mo, we walk him at least twice daily, today, after dinner/walk, he was starting the "zombie" behavior again, as he usually do after dinner, but this time is really scaring me, because he is jumping at me, and howling aggressively, I was trying to use my hand to hold his mouth, but he is more aggressively biting my hand!! Until I pick up a wood stick and say "sit" loudly, he seems calm a bit, but still try to bite me; later, we go back into house, he peed on the floor... What's wrong with him? In the morning he is a nice boy, obedient and following instruction very well. We also read a lot and set up a leadership, but still confused about his evening "zombie" behavior, and the aggressive biting is kind of intolerant. I'm deeply worried about this!! Shall I schedule for a private training course for him? Is this normal for other puppies? Also, he is barking a lot!!