When I ride, my pony over jumps all the fences, what is your advice to overcome this problem?

put a cross rail up or even just a ground pole to canter to and go over it until he doesn't over jump it. don't higher it keep everything the same. it may put a hard and maybe even a long haul on advancing but it will help.
@emmayanek everything that you said but also maybe try starting with low jumps rather than high. Then work your way up
Half halt the whole way through the jump. Sit deep, relax. Try a running martingale.
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