| icing |
 | 1) A physical therapy procedure, properly known as "cryotherapy." 2) When a horse is stood in a tub of ice or ice packs are applied to the legs to reduce inflammation and/or swelling. |
| IM |
| Abbreviation for intra-muscular; an injection given in a muscle. |
| impaction |
| A type of colic caused by a blockage of the intestines by ingested materials (constipation). |
| impost |
| Weight carried or assigned. |
| in foal |
| Pregnant mare. |
| in hand |
| Running under moderate control, at less than top speed. |
| in the bridle |
| See on the bit. |
| in the money |
| A horse that finishes first, second or third. |
| inferior check ligament |
| A direct continuation of the posterior (back) ligaments of the knee (carpus), located below the knee. Function is in support of the deep flexor tendon. |
| infield |
| Area encompassed by the inner rail of the racetrack. |
| inquiry |
| Reviewing the race to check into a possible infraction of the rules. Also, a sign flashed by officials on the tote board on such occasions. If lodged by a jockey, it is called an objection. |
| insensitive laminae |
| The layer just under the wall of the hoof; similar to the human fingernail. It is an integral structure that helps to attach the hoof wall to the underlying coffin bone. |
| intra-articular |
| Within a joint. |
| Irish rail |
| Movable rail. |
| irons |
| See stirrups. |
| ischemia |
| Deficiency of blood supply, which may be temporary or permanent. Caused by the shutting down of the blood vessels. |
| isolation barn |
| A facility used to separate sick horses from healthy ones. |
| ITW |
| Intertrack wagering. |
| IV |
| Abbreviation for intravenous; an injection given in the vein. Jack spavin |
