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In page Dressage:

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The tail is usually not braided (although it is permitted), because it may cause the horse to carry the tail stiffly. Because the tail is an extension of the animal's spine, a supple tail is desirable as it shows that the horse is supple through its back. The tail should be "banged", or cut straight across[citation needed] (usually above the fetlocks but below the hocks when held at the point where the horse naturally carries it). The dock is pulled or trimmed to shape it and give the horse a cleaner appearance.