Horse Glossary

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Impaction - Blockage of the digestive tract with food material (usually in the large intestine).
Impulsion - The energy and thrust forward characterized by a forward reaching rather than a backward pushing motion.
In the hole - Third in line to enter the pen; after "on deck."
In-and-Out - Combination fence.
In-hand class - A class in which the horse is led by the exhibitor.
Inside - In a pen or riding ring, the side of the horse toward the center.
Interdental space - The space on the horse's jawbone between the incisors and pre-molars where there are no teeth, making room for the bit.
Intestinal flora - The normal bacteria found in the intestine.
Intravenous - In the vein.
Intussusception - Telescoping of the intestine.
Inversion - A dangerous condition where a horse's respiration rate is higher than its pulse rate.
Irons - Stirrups on an English saddle.
Isoerythrolysis - A condition in which antibodies in the mare's colostrum destroy the foal's red blood cells.