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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