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Like all parts to the anatomy, the hock of a horse is important to the mobility of the horse. The hock is located approximately midway down the hind legs of the horse. Ideally, hocks are slightly higher than the knees on the front legs, with the point of hock level with the chestnut of the front leg. It is the joint that moves in a backward motion, opposite to forward motion of the front knee.

This particular joint must be strong enough to take the thrusting power of the hind quarters of the horse, plus the horse's weight and the weight of a rider. The hock is made up mostly of bone and tendon. The muscles that flex and extend the hock are in the upper leg

From the rear, a good hock should appear rectangular and bony, without any lumps or swellings. It should be noticeably wider than the long, relatively straight cannon bone below it . From the side, it should appear clean and bony, with no lumps above or below it.

Since the horse's main source of power is in the hind quarters, they have evolved a thrust that can take them into a flight situation, to avoid a predator. This powerful thrust can also hurdle them over high jumps with the weight of a rider and equipment, up to a third of their own weight. All of this pressure becomes centered on the hock joints.

There are many things that can go wrong with the hock, because of the type of pressure and the weight, the horse puts on the joint and it is essential to watch for problems. Swellings, ripped tendons, bruised bone can and do happen and it is necessary to use quick remedies such as massage, hot/cold baths or liniments and wraps for the minor damage, much as a human would do for a twisted, swollen ankle. A limp may also indicate a damaged hock.

Sometimes a horse may be born with one or both hocks formed improperly. When looking at the conformation of a horse, look deeply at the hocks. If the hock is higher than normal (short gaskin), then the horse may have a downhill balance with the croup (rear quarters) higher than the withers (shoulders). This is often seen in race horses or gaited horses and it can result in a sickle hock conformation.

If the hock is lower (long gaskin) then normal, it gives the appearance of a squatting horse. Stock horses often have this squatting look. The long muscle has reduced efficiency to drive the limb forward, making it hard to engage the hindquarters. It reduces the rear stride length, forcing the horse to take short steps.

If the hocks appear too small, then the horse can develop

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