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In page Russian Don:

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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.[1]