Cheval de la Sierra Tarahumara — an extremely primitive, very hardy mountain breed of horses, formed in the highlands of the Sierra Madre (Chihuahua state, Mexico). One of the smallest and «dry» breeds of domestic horses in the world. Height at withers 1300–1480 mm (ideal 1350–1420 mm), weight 320–420 kg, body length 1450–1580 mm. Build light, dry, square format (format index ≈1.02–1.06), with well-defined mountain constitution. Head small dry (length 480–550 mm), profile straight or slightly concave. Eyes large dark brown. Ears 110–140 mm. Neck of medium length (550–680 mm). Body compact deep, chest narrow but very deep (depth 680–750 mm, ≥48–50% of height at withers), back short strong (420–480 mm). Limbs dry and strong, pastern girth 165–185 mm, fetlocks 90–110 mm. Hooves very small (width 110–125 mm), extremely hard, often goblet-shaped. Tail low set, thick. Coat dense, short in summer and thick long in winter (up to 35–40 mm) with abundant undercoat. Acceptable colors: bay (all shades), dark bay, brown, grullo, dun, red dun, rarely roan and pinto. Differs from the basic domestic horse by extremely small stature with high performance, exceptional dryness of constitution, strongest hoof horn and high proportion of «wild» blood.