Join Date: Feb 2012
Location: The Bluegrass State
First, check for pain. Always always always check for pain first, in any situation. You don't want to push them if they are hurting. Make sure his tack fits, his back isn't sore, his legs are in good working order, teeth and feet are up to date, etc.
Once he is cleared, sound and safe, you can work on the issue at hand. I would work on his bending/flexing. Get him working off of your legs well. Tip his nose to the right, and push with your right leg to get him to move to the left. Make sure you can move him off your leg, and get him bending whichever way you need him to. That will help a lot. After that, I would probably work on circles. Circle him to the left on the left lead, let him get comfy. Then, try to canter to the right on the right lead. If he doesn't get it, let him canter a few steps on the wrong lead, then stop and back. Ask for the right lead again. If he misses it, circle tight to the right on the left lead for a few seconds, then stop and back. Make the wrong lead uncomfortable and hard.
When he does get it, loosen your rein, give him big pats, and go back to a straight line. Let him go where he wants (if you're in an arena) and make cantering to the right easy. Eventually he will be going just as easy both ways! This is how we got Cowboy from CONSTANTLY taking the left lead. Worked great, and very quickly! :) Best of luck, have a great time at your show!
~ When I Die, Remember Me By My Horses ~
* Because They Are Responsible *
.: For Letting Me Live :. (c) xJumperx