06-09-2008, 10:41 AM
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Leave them out. Unless you have a small pen with NO SHELTER and the only other option is the stall. Even then, most barns, without the benefit of a fan can become sweltering quickly.
If there's any shade anywhere in the pen, let them out! They will find where the best shade and breeze is, plus they can see the rest of the world, which horses prefer to being locked up anyways. The social interaction, the freedom to move and the buddy system they have of swishing flies (standing nose to tail) would make them much more comfortable than just being stall bound. Just make sure they can reach fresh water and a salt.