I adopted an 8 week old puppy from a shelter and had him for a month now so he about 12 weeks now. I try to train him everyday but he is getting worse instead of better. I got a gate to confine him to one area and he goes insane by barking whenever I leave the room. When I try to play with him, all he does is bite and jumps on me. I give him PLENTY of chew toys and I reward him for good behavior but it doesn't seem to work. I tried yelping, ignoring him, giving him time out.. nothing works....What else can I do?