Heel is when the dog is right beside your leg. Not in front, not behind.

I'm still in the process of having kai walk nicer. He knows heel but I don't really care if he heels during a walk..I just want him to stop pulling my arm off. A very experienced dog trainer on a sheltie forum told me to try a technique where you turn around when the dog pulls. So...if katie starts pulling in front, you turn around and walk away from wherever she wanted to go.