The Criollo originated in Argentina in the southern part of South America and was derived from the 100 Spanish horses brought to Rio de la Plata in 1535 by Pedro de Mendoza. The Criollos are descended from early Andalusian horse, with a definite Barb influence. There is also an influence from the Sorraia and the Asturcon. In 1918 a breed society was formed and requires the Criollo to go through intense endurance testing for the selection process.The Argentinian army uses the Criollo for riding as well as pack animals. The Criollos are able to carry heavy weights over long distances and rigorous terrain. They are tough, sound, and able to be maintained in severe weather conditions, and shortages of water and food. The Criollo average height is 14 to 15 hh and has a stocky build with a short, thick neck. The Criollo are used for crossbreeding with other animals from Europe and the US to produce a more elegant horse, unfortunately the crossbred product is not as hardy as the Criollo.