Michelle, I just saw the pics of you and Riggs on the post you put up under the "working" section.
He has great position in all of the pics. You also have a particular angle to your head, and eye contact, in all of the pics.
It looks to me that you have inadvertently trained Riggs to heel with him relying on the picture he sees when he is looking at you, rather than the position he is in relative to your body.
This is a easy and common mistake made when you have to look at them to make sure they are in the right position... then don't wean them off of the "picture", rather than know the position (or... give them a new picture).
It should be fairly easy to fix if you understand the problem.

