Young horses are known as The primitive horse probably stood 12 hands (about 120 cm, or 48 inches) tall at the withers, the high point on the back at the base of the neck, and was dun coloured (typically brownish to dark gray).
Domestic horses gone wild, such as the mustangs of western , tend to revert to those primitive features under random mating: they generally are somewhat taller (about 15 hands), are usually gray, dun, or brownish in colour, and move in herds led by a stallion.
Domestic horses tend to be nearsighted, less hardy than their ancestors, and often high-strung, especially Thoroughbreds, where intensive breeding has been focused upon speed to the exclusion of other qualities.
The is relatively small, and, since much vegetation must be ingested to maintain vital processes, foraging is almost constant under natural conditions.
Domestic animals are fed several (at least three) times a day in quantities governed by the exertion of the horse.