When Duke was that age I taught him "leave it" without the command when treats were in my hand. I held a treat in my fist and he would try to get the treat (pretty painful at first) but eventually he would realize he couldn't get to it... Then as soon as he pulled back from my hand to think about it, I would start to open it. He would of course attack it, and the instant he moved towards the food I closed my hand again. We repeated these steps until he was able to back away from the food and wait for my "yes" or the clicker. He eventually learned that taking food out of my hand without permission wasn't going to work. We wound this into his training by asking for a sit, or eye contact, etc.
We are also working on the "Protocols of Relaxation"... Which is great so far. You can find the document through google, and there is also a website with free Mp3 files to train with. I wish I had started these when he was younger!
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