How do you teach this? I'm trying to teach Sam to stand up from a sit/down but I don't think he gets it. He'll, at best, stand up but then sit down as quickly as possible while I give him the treat. What I do is (from a sit) put the treat near his face and then pull it forward so that he has to lift his butt off the ground to reach it, but instead he downs in hopes of getting the treat for doing that. Down doesn't have a hand signal anymore and "down" and "stand" don't really sound very similar at all. When I'm having him stand from a down I put the treat in his face and then pull it up and forward, but then he sits instead. Any help?