Originally Posted by usandpets
It's just like any other "Oh no!" spot. You just have to get them accustomed to being touched there. Start with a cue stick or something long enough to keep you safe. Rub it on their belly and work your way back. If they move or kick at it, let them. Just keep holding it there as best you can until they stand still. Then move the stick forward and rub and repeat. As they get better at standing still, you can switch to using your hand. Do it every day for a week. By then it will be just another part of you grooming them.
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This will work for almost every horse. I use a heavy dowel rod with a sponge on the end. There are the few exceptions that it won't fix though, I've got one of them. I spent a good month fighting the good fight to get him over it and he still will "kick a barn down" to avoid it. He's great with pretty much anything else asked of him so I sedate him and don't bother with the battle.