Tail sets on gaited breeds?

I know little to nothing of the gaited horses, but I've heard of people putting the horse's tail in a tail set, and at the hall of champions at the KY horse park years back they talked about how when CH Imperator retired they "took his tail down". What exactly is a tail set? Can anyone... show more I know little to nothing of the gaited horses, but I've heard of people putting the horse's tail in a tail set, and at the hall of champions at the KY horse park years back they talked about how when CH Imperator retired they "took his tail down".

What exactly is a tail set? Can anyone explain this? Does it stay "set" until they retire? I always thought these breed's tails just stood up on their own, as I never see any devices on their tails in photos.
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