The American Quarter Horse is a breed of horse originally bred for sprinting short distances, typically races of a quarter mile or less.
The Quarter Horse is the most popular breed in the United States, and is the largest breed society in the world, with over 3.2 million Quarter Horses registered worldwide.
It is commonly believed to be the world's fastest horse over short distances, and has been clocked at 55 mph.
The 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 Quarter Horse is well-suited to the intricate and speedy maneuvers required in calf roping, reining, cutting, working cow horse, barrel racing and other western riding events, especially those involving live cattle.
The versatile Quarter Horse is also shown in English disciplines, driving, and many other equestrian activities.