A horse is measured in "hands". A hand is 4 inches. The measurement is taken from the ground to the top height of the horses withers. If a horse measures 65 inches, he is 16.1 hands. A pony is 14.2 hands or shorter.
horses are measured in hands. 1 hand = 4 inches therefore.... a horse that is 15.3 hh (hands high) is (15 x 4 + 3) 63 inches tall you measure a horse from the withers... the lump where their neck starts