That's when North South fetching helped me. Not quite the same problem as me but close enough this might help you.
Snowshoe's Album: North/South Fetch
I should note, due to family situations with me and the trainer, (both our elderly Mum's sick and his died) we did not continue with this training. All I wanted was to get a Working Certificate but stuff just happened and we didn't. It still works though, the N/S.