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How to Identify a Thoroughbred
Night-Eyes (Chestnuts)
Night-eyes (or chestnuts) are horny, irregular growths found on the inside of the legs. On the fore legs, they are just above the knees and on the hind legs, they are near the rear of the hock. No two horses have been found to have the same set of night-eyes and since they do not change in size and shape throughout the adult life of the horse they are found to be extremely useful in identification. The Jockey Club may ask for a set of night-eye photos to assist in the identification of horses with no white markings or gray/roans. These photos should reveal as much detail as safely possible to indicate location, shape, and outline.

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