Noah (8months) can be a complete sweetheart and then in an instant he can decide to be a real pain. He will turn a petting into play nipping at your hands and then jumping up. If you correct him with "Off" and push him down on the floor he just gets more intense. I then stand up with my hands on my hips and look at him and he starts pacing around the room barking and bowing. For a while I was trying to hold him on his side until he settled down. Even when he is on his side, he always has a paw on top of my hand, no matter how many times I correct this. Lately, he has been trying to hump my wife. He hasn't done this to me yet. Today, he got out the front door and after I finally caught him he nipped at me repeatedly. I had to hold him down to get him to stop. He didn't bite quite hard enough to draw blood, but more to try to get me to back off. After he got up and we started walking back, he then stopped walking, rolled over on his back so I would have to drag him. Then he continued to try to bite me again. I held him down again until he calmed down. He was showing teeth and growling while biting at me. Obviously he believes that he is the Alpha dog. What can I do to remedy this situation?