Ponies are usually small in size and stocky looking. They have been developed for use in specific environments. The depth of their body is usually equal to the length of their legs. In many equestrian competitions, any horse under 14.2 hands high (58 inches, or 147 centimeters) is considered a pony.

Ponies weigh from 200 to 1,500 pounds (91 to 680 kilograms).

Light horses are bred for riding, racing, jumping, and herding. Their long, thin legs are designed for speed. Long, flexible necks help them stay balanced while running and maneuvering. Well-defined withers allow light horses to be easily fitted with a saddle.

Light breeds generally weigh from 800 to 1,500 pounds (363 to 680 kilograms).

Heavy breeds–also called draft horses–are big, massive horses. They are built to pull plows and wagons, and to carry hefty loads. Their relatively short, sturdy legs give them better leverage when pulling. Short, muscular backs and powerful hindquarters allow them to tow substantial weights.

Heavy breeds weigh from 1,400 to 2,700 pounds (635 to 1,225 kilograms).