I have manage to teach her to sit today with very little effort. However, after I leave or when she sees me with food she gets up and starts jumping. I also took her to the park today. She's calm around other people who just casually walk pass by slowly. The bad part is when she try to pull me while seeing people riding bikes pass by and other dog owners. She doesn't go after my small dogs at home though. Can you guys give me some advice on how to stop these behavior problems.