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Horses should not eat off the ground. When they snuff around and lick up the tiny leaves of hay, they injest sand and dirt. This can gather in the large or small intestine, compacting into a substance like cement. Horses need to be fed in stall or on rubber mats that are swept frequently, and also need Psylium(SP?) for a week out of every month to prevent sand colic.
Sand colic occurs when sand impacts into the intestine from a horse eating off of the ground. The large lump of rock-like stuff blocks the passage of food, causing the horse to bite at itself, kick it's belly, and roll. Mineral oil may help if administered quickly, although occasionally a veteranarian will need to surgically extract the sand.
ANY horse showing signs of colic needs a veterinarian NOW. Remove all food, allow small amounts of water if desired by the horse. Keep it up and walking until the vet can arrive. Colic signs- Rolling, biting at sides, lying down and not getting up, abnormal breathing (not very common but vet immidiatly required), Kicking at stomach, refusal to eat.