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Regardless of a horse's actual birthdate, for most competition purposes, horses are considered a year older on January 1 of each year in the northern hemisphere and August 1 in the southern hemisphere. The exception is endurance riding, where the minimum age to compete is based on the horse's actual calendar age. A very rough estimate of a horse's age can be made from looking at its teeth. Yearling: a horse of either sex that is between one and two years old. It is thought that the largest horse in (recorded) history was a Shire horse named Sampson, who lived during the late 1800s. He stood 21.2½ hands high and his peak weight was estimated at . The current record holder for the world's smallest horse is Thumbelina, a fully mature miniature horse affected by dwarfism. She is tall and weighs . The difference between a horse and pony is not simply a height difference, but also a difference in phenotype or appearance. There are noticeable differences in conformation and temperament. Ponies often exhibit thicker manes, tails and overall coat. They also have proportionally shorter legs, wider barrels, heavier bone, shorter and thicker necks, and short heads with broad foreheads. They often have calmer temperaments than horses and also a high level of equine intelligence that may or may not be used to cooperate with human handlers. The horse (Equus caballus) is a large odd-toed ungulate mammal, one of ten living species of the family Equidae. Modern light horses, all descended in part from the Arabian horse, the oldest surviving breed of known lineage, include the Thoroughbred, celebrated as a racehorse; the American saddlebred horse, known for its easy gaits; the Morgan and the quarter horse, favored for riding and cow herding; and the Standardbred, or trotter, developed for light harness racing. The Appaloosa and the Pinto, much used in cow herding, are distinguished by their patterned colors. The palomino is not a breed but a color type. Among the small horses are the Shetland pony and Welsh pony. The terms cow pony and polo pony refer to the animal's use rather than its size or breed. Although little used for work today, horses are widely owned for recreational riding and show activities.
Horses and humans have lived and worked together for thousands of years and an extensive specialized vocabulary has arisen to describe virtually every horse behavioral and anatomical characteristic with a high degree of precision. Horses are trained to be ridden or driven in many different sporting events and competitions. Examples include horse shows, gymkhana and O-Mok-See, rodeos, endurance riding, fox hunting, and Olympic-level events such as three-day eventing, combined driving, dressage, and show jumping. Although scoring varies by event, most emphasize the horse's speed, maneuverability, obedience and/or precision. Sometimes the equitation, the style and ability of the rider, is also considered. The English-speaking world measures the height of horses in hands, abbreviated "h" or "hh," and is measured at the highest point of an animal's withers. One hand is . Intermediate heights are defined by hands and inches, rounding to the lower measurement in hands, followed by a decimal point and the number of additional inches between 1 and 3. Thus a horse described as 15.2 hh tall, means it is 15 hands, 2 inches, or in height.
The horse (Equus caballus) is a large odd-toed ungulate mammal, one of ten living species of the family Equidae.