I need help. My dog has biten me, viciously for the 2nd time now, drawing blood, and has tried many other times. Mainly when I get close to him with a treat, or when I try to take stolen socks away from him, but mainly when there is food around and I come close to him. He is almost 5, and he has only recently started biting like this. He is fully potty trained, and has knowledge of baisic commands (sit, come, down) How can I get him to stop this biting, and listen. When I tell him to come, he almost never does (without food.) He will sit when told though. He Jumps on people, he doesn't leave us alone at the dinner table. I need to start being stricter with him, I know that for a fact, but what else can I do to stop him when he is in a vicious state? Please, Please help. He is about 20 pounds.