Originally Posted by tlkng1
Never use cold water on a non-sweater if they are really hot..or any horse for that matter.
Just about every endurance rider I know here on the East coast (esp those with heavier breeds like Morgans) uses massive amounts of ice water on their horses in a hold. Depending on the horse you may not hit their hindquarters with the cold water, but it goes everywhere else! Throwing cold water on a hot horse and then scraping that water off is by far the most effective cooling method I have found (tho it's always nice when someone brings a big fan too, but generally no electric where holds are).
To the OP, does where you ride have access to water (streams, water tanks, a friendly neighbor who would let you use a hose?). If so, bring along a sponge or a scoop so that you can wet down your horse during the ride. That helps a lot.