The Racking Horse is a horse breed derived from the Tennessee Walking Horse, recognized by the USDA in 1971. It is known for a distinctive singlefoot gait. In 1971, the Racking Horse Breeders' Association of America, headquartered in Decatur, Alabama, was formed as the breed registry. Its goal is to preserve the breed in a natural state with little or no artificial devices that enhance gait. The horse's tail is naturally raised without nicking or tail sets. Some classes allow special shoes that enhance action, and a relatively newer class allows the use of chains, six ounces and under as action devices. The practice of soring, illegal under the Horse Protection Act of 1970, is also seen within the Racking Horse world. Since the breed's inception, about 80,000 Racking Horses have been registered, with the largest populations located in the US states of Alabama and Tennessee.