I would like to know the answer to that to! I have a hard time getting Blade to stand still.
Well for one, they don't get a treat if they don't do it right:).
Let them know you have a treat for them, then don't ask for the full stretch right at the start, just work them slowly, but reward ONLY AFTER they do it properly.
They will get the hang of it. Maybe some would take longer. Harley is just excellent at whoaing when you tell him too. He came that way, I can't take credit for it, altho I've made him stay that way.
Becky