This was a first today. My 4 1/2 month growled and showed his teeth when I tried to take his bone away. He has never done anything like this and it was very upsetting. I stopped and took a few minutes to try to figure out what to do about it. Then I was ready (with a can of coins) I tried again to put my hand near his mouth and he did the same. I immediately shook the can as loud as I could and screamed NO at him. He dropped the bone and looked at me in total shock. After we calmed down I gave the bone back to him. I then petted his back and moving closer to his face finally touching him around the mouth (with the bone in it) I had a treat in the other hand and told him to "give" . He dropped the bone and I gave him the treat..... I don't know if I'm going about this the right way but Ill tell you, This was a first and I will not let this go on. Any others who have dealt with this at such an early age and what did you do.... I will probably try my method again tomorrow.... unless someone gives me some better advice.