Join Date: Apr 2010
Location: ~*~ NEBRASKA ~*~
First, I would rule and any physical causes. Could he be sore on one side, even a stone bruise can cause this believe it or not. Does he have any tightness or soreness in his back? You may want a chiro to check him out. Also, it sounds like he might have more muscle development on one side and this could take a little time to correct. Be sure to rule out anything physical before you assume it's behavioral. Cinny always has a hard time going to the left when he's due for a trim.
All physical things ruled out, I would begin at a walk and get him turning correctly at a walk. Try a nice, smallish circle at a walk. When you want to turn, step back and gently tug your lunge line and give him a light tap on the rump to encourage him to keep moving forward but in the direction that you want. This is easiest done in a round pen. Don't worry about getting a sharp turn at first, forward action is much more important. Do this until you have him turning at the walk for you, then try a trot/jog with a slightly larger circle. When we are incorrect, make him work a little harder, maybe push him into a trot or canter to make him work harder, then slow him back to a walk and ask again. Make it more work to do what he wants than to do what you want. When you can get him doing it the way you want a couple times, stop and end on a good note.
Remember, it takes time and patience. It's not going to happen in one day, especially if he's unevenly developed.