Some horses do try to eat even with a stomachache. If you suspect your horse has colic remove all food from his stall or paddock. He could have a blockage and eating could make it fatal. And call in your vet. Colic is very serious in the horse, and the sooner the vet is involved, the better the chances for a good outcome.
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Well, you can't.
Buy some Antispasmodic medicine. Then, if the horse is too thin, feed it more. Since it's summer, I suggest putting them in the meadow for oh....six hours or so. If it's overweight, only feed it about 4 pounds.
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Some horses will try to eat hay if the colic is mild enough, but you should be cautious about letting them have it as it could make the situation worse.