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Quick Answer. The American quarter horse is the fastest breed of horse in the world, followed closely by the thoroughbred. However, Arabian horses outpace other breeds in endurance racing.
The fastest breed is the American Quarter Horse which can reach 55 miles per hour for a quarter of a mile. Thoroughbreds however can keep 40 miles per hour for a mile but even the fleetest Arabian could not achieve the speed of a Thoroughbred or Quarter Horse.