THE coat of an unrugged horse stands up in cold weather to trap air and warm the horse. If you decide to rug you have to compensate for this mechanism, as a rug will stop the hair from being able to do its job. In some circumstances a rugged horse is actually colder than an unrugged horse, especially if it is a badly fitting, thin rug that flattens the hair and reduces the movement of the horse without providing any real warmth.

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