The Thoroughbred
Thoroughbreds are the fastest breed of horse.  They are primarity used for racing and English riding (especially jumping and horse shows).  These horses have long and powerful legs, a small head with expressive eyes, a long and muscular neck, a sloped shoulder, wide chest, and long back.  Most of these horses are bay, chestnut, or gray.  Many Thoroughbreds can be high-strung and difficult to ride, but not all are like this.

Links:

The Jockey Club

Partial Bibliography:

Dossenbach, Monique and Dossenbach, Hans.  The Noble Horse.  New York: Portland House, 1987.
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