| Oaks |
A stakes event for 3-year-old fillies (females).
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| Ocd Lesion |
A cartilaginous or bony lesion that is the result of a failure in development.
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| On The Bit |
When a horse is eager to run. Also known as "in the bridle."
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| Open Knee |
Reverse condition of closed knee, often found in young horses, indicating an immature knee. See "closed knee."
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| Osselet |
Bony growth on the fetlock or ankle joint, initially due to increased joint fluid which causes the joint capsule to swell, later resulting in calcium deposits at this joint.
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| Over At The Knee |
A leg that looks like it has a forward arc with its center at the knee when viewed from the side.
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| Overgirth |
An elastic band that goes completely around a horse, over the saddle, to keep the saddle from slipping.
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| Overnight |
A sheet published by the racing secretary’s office listing the entries for an upcoming racing card.
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| Overnight Race |
A race in which entries close a specific number of hours before running (such as 48 hours), as opposed to a stakes race for which nominations close weeks and sometimes months in advance.
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