The Russian Don breed of horse.

The Russian Don is a breed of horse developed in and named after the steppes region of Russia where the Don River flows. Utilized originally as cavalry horses for the Cossacks, they are currently used for under-saddle work and driving.

The Don usually stands 15.1 to 15.3 hands (61 to 63 inches, 155 to 160 cm), and may be bay, black, gray or chestnut. They have a clean head with a straight or dished profile, well set onto a well-formed neck, high withers, and a wide, deep chest. Their shoulders can be straight, limiting the length of their stride, but are often well-formed. The back is long and straight, flowing into a croup that is long and sloping. The legs are long, well-muscled, and clean with broad joints, strong tendons, and tough hooves.

The main use of the Russian Don breed in past times was as the mount of the Cossack cavalry. Known for their endurance and stamina, these horses could cover long distances in short amounts of time, with reserves of energy left for battle. Today, the Don is widely used as a saddle horse, and is also used in harness, often in the traditional Russian tachanka, where four horses are hitched side-by-side

The Don played an important role in the development of many other USSR-developed breeds, including the Budyonny.