I had the same thing with Betty when I had her. She would go at my heels anytime I went into a run. How I cured that is to start with a good heel. Once you are walking good with your dog next to you, then you can work up to a fast walk. Once you reach a fast walk, you can up it to a slow jog for short distances, just keep working on it. Eventually you will be jogging with your dog next to you. It took Betty about 2-3 months to get to where I can run with her next to me or in front without her going after my heels. But I think the key to it is a good heel first, set some rules and boundaries. Then work your way up from there.