That sounds more like a health problem rather than a training problem. Most horses are fairly sure-footed. If they routinely have "heinous balance", it usually means that there is something wrong with their hooves, body, brain, et cetera. Or, that the rider is pulling/leaning/manipulating the horse out of balance.
I actually want my horses out on uneven footing. It helps them teach them to mind their feet. Some of the most stumbly horses that I have ridden were only kept and worked on a 0 degree plane. They'd fall right over if they were ridden on the rough trails that I ride.
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Last edited by Wumbo; 09-23-2020 at 02:20 PM.