Or better: show him that YOU are the boss without agression!
- take him out of the band and make excercises with him, like who starts plays and who says when to stop
- don't leave the food before him, not even the bowl when it's empty and when you give him food, immitate that you eat from his food and only than he is allowed to eat. Only after you! Never call him to eat, you don't serv him, you just let him some food as you don't need more
- who steps out first off the door (you, of cource! he must not step out of the door before you!)
- be consequent! No means not. Funny that to most of