08-27-2012, 05:10 PM
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Probably because he's bored, or like Allison mentioned he may be getting an endorphin release from it.
I find it rather amusing, but if it became an issue where the horse was putting its health at risk I'd probably try to find a way to keep the horse amused. Plenty of hay, toys in the stall or in the paddock, a pet goat...