Our last horse trial of the year is coming up. The dressage part will be on grass which means lots of extra gas in the tank for horsey. Every time we do our test on grass, he jumps the gun during his trot circle to his right lead canter circle. It's a beautiful transition, but ultimately wrong since I didn't ask for it. My question is, does anyone have any suggestions on how to catch it and prevent it? I'm taking a dressage lesson to try clean up my cues, but he's got a real sense of humor about this particular thing and is bound to try it no matter how well I'm riding. We've been scoring steady 7s and 8s lately, so I really want to nail it this time.
I've already started taking him into every field, ring and bald spot I can find and riding trot/canter transitions making sure they are on my terms and not his. He's been a bit pissy about maintaining the trot and not breaking into the canter, but eventually he settles down and does what I want. Problem is, we only have one shot during the test. I doubt the judge would appreciate all the bucking and head tossing before behaving part.
I guess ultimately my question is, if I do sense that hind leg is about to push off, what cue would I do to prevent it, if any? It is easy as blocking the inside shoulder? I know easy & dressage do not go together.