The Criollo is extremely hardy, frugal, and tough, resistant to great discomfort, and a fast and hard worker. The Criollo is used extensively as a cattle horse in South America's beef industry. They are used with great success in endurance riding and as a cross to produce the famous Argentinian polo pony. The Criollo is extremely hard and tough. Criollo Horses stand about 15 to 16 hands high.