I have a 14 year old TB with plenty of energy when he jumps. He loves to do it, so he likes to speed up a lot and run around the courses like a mad man. I am currently in a simple D-ring, and think I need something with a little more leverage. He really isnt THAT bad however, so I don't need anything too severe.
The other aspect is that he LOVES to play with his mouth. He sticks his teeth out and rolls his tongue around. We were thinking that perhaps something with a roller or something he can play with might help too?
He turns well off my leg, so that is not really an issue.