I have a 9 month old female chihuahua that I can't get to sit for a treat. If I can't get her to sit for a treat how am I going to get her to heel when training on a leash, granted she's very good on the leash. I've tried using her favorite treats and then trying to put it over her head and she just walks away and barks like she's afraid. I've tried standing in front of her to get her to sit and she just walks around me. The last thing I tried was to put her on my bed to make it higher up and still no go. Help!