Which breed is known for its speed and is often used in racing?

The Thoroughbred is widely recognized for its exceptional speed and agility, making it the predominant breed in the world of horse racing. This breed has been specifically developed for high performance in competitive racing environments, with a focus on sprinting capabilities, endurance, and a competitive spirit. Thoroughbreds are also well-known for their athletic build, long legs, and powerful strides, which all contribute to their reputation as the fastest horse breed.

Other breeds mentioned, like the Clydesdale and Percheron, are primarily draft horses, bred for strength and heavy work rather than speed. Draft breeds are characterized by their robust builds and are typically involved in tasks such as pulling heavy loads or farm work. The Shetland Pony, while hardy and versatile, is a smaller breed primarily used for children and in pastoral settings rather than racing. Hence, none of these breeds are associated with racing in the same capacity as the Thoroughbred.