I followed the training lesson on Beg, but I can't get Valentine to sit pretty. She goes straight to jumping up. If I don't give her room to jump up (the treat is very close to her head) than she moves over or back and then jumps. I tried it against a wall and she moves sideways and then jumps. I've tried placing her how I want her but that doesn't do it either. She has a real jumping fixation. Any suggestions?