The American Quarter Horse is an American breed of horse that excels at sprinting short distances. Its name came from its ability to outdistance other horse breeds in races of a quarter mile or less; some individuals have been clocked at speeds up to 55 mph (88.5 km/h). The American Quarter Horse is the most popular breed in the United States today, and the American Quarter Horse Association is the largest breed registry in the world, with more than 5 million American Quarter Horses registered.
The American Quarter Horse is well known both as a race horse and for its performance in rodeos, horse shows and as a working ranch horse. The compact body of the American Quarter Horse is well-suited to the intricate and speedy maneuvers required in reining, cutting, working cow horse, barrel racing, calf roping, and other western riding events, especially those involving live cattle. The American Quarter Horse is also shown in English disciplines, driving, and many other equestrian activities.
The horses used for saddle seat and fine harness competition, the disciplines where the breed dominates, are flashy, high-stepping animals, with exaggerated action. Saddlebreds are sometimes used in western classes and in the sport horse disciplines. The Saddlebred is very sensitive and alert. The ideal American Saddlebred is well-proportioned and presents a beautiful overall picture. Large, wide-set expressive eyes and gracefully shaped ears set close together are positioned on a well-shaped head. The neck is long with a fine, clean throatlatch and is arched and well-flexed at the poll. The American Saddlebred sports well-defined and prominent withers, while the shoulders are deep and sloping. Well-sprung ribs and a strong level back also characterize the breed. The legs are straight with broad flat bones, sharply defined tendons and sloping pasterns. Saddlebreds are usually black, bay, or chesnut, but grays, buckskins, palominos, pinto and occasionally roans are also seen. From Wikipedia