My new chi is having some dominance issues. We have had him three days now and he has been ok, no snapping at least, with my dogs and really sweet with us. We got him from the shelter and don't know a whole lot about him except he is an adult male. Well, today he went crazy on me. He was on the bed with me and I got up to take him out to potty. I told him to come on, but he wouldn't, so I went to pick him up. He tried to bite me everytime I tried to pick him up. He let me pet him, but as soon as I put my hands around him he tried to bite them. I kept telling him "no", but he wouldn't stop. I thought he was sore at first from the neuter, but then my other dogs made some playful fighting noise and he quickly got up and jumped down to investigate. I went to pick him up off the floor and he was fine with that. A while later today he jumped on the couch with muddy feet and I went to take him off and he tried to bite again. I tried to move him to the edge so he would jump off, but he still tried to bite. He put up a huge fight and finally just jumped off by himself. He immediately let me pick him up off the floor with no fuss. How do I deal with training this out of him? I want him to know that we are the boss and he has to listen to us. Any advice will be appreciated.