It was by pure accident one day. I held his greenie up for him to stand up and get it and as he did he turned around in mid air. From then on whenever he stood up I would take the greenie in a cirlce and he would turn with it. Yesterday for the first time, I held the greenie up and he did the dance on his own, twice! It was so adorable. He now knows he has to dance for his greenies!