Pure race espagnole
The physical characteristics seen in the breed are currently in flux, so there is not a single breed phenotype, though many members of the breed closely resemble the Mérens. Enthusiasts are breeding for a rustic mountain horse, of medium size, with good gaits and good temperament. Some members of the breed closely resemble Iberian horses such as the Andalusian horse. The official breed standard calls for a moderately long neck and long, sloped shoulder, broad back, rounded croup and muscular legs. Some members of the breed are branded on the left hindquarter. Because of its relative rarity and physical similarities, the Castillonnais is commonly confused with the Mérens.