I'm eventing this year and my horse is good at dressage at home by himself, but when I bring him places, he’s always buzzy. Is there anything I could give him to relax him for dressage?

My rider has the same kind of pony. When we go to the competition arena in the morning we take him for a walk and let him graze and relax. And after warming up for competition she makes him walk for 10minute with long rein which makes him relax.
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