Left Lead Canter Trouble. Tips?

Race horses run with whichever lead is preferred by the horse. His muscles have developed for that lead. He will want to revert as it is more comfortable for him both physically and mentally.

What muppetgirl said has worked for my OTTB. Just be very patient and know that it will eventually get there. Don't rush your horse into the canter. If he does a fast trot and doesn't respond, bring me back and get him collected again.
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I also must add, walk slow collected circles, trot slow collected circles and make sure everything is soft and collected before cantering....if you have to pull him down for the wrong lead, start again being soft, collected and most importantly relaxed.....it's a series of repetition....askin him, correcting him, asking and releasing and rewarding when he does the right thing