Keep a scraper in one hand while you hose down your horse with the other, and use that scraper quickly and continuously.? If warm water remains on a hot horse, it acts like a blanket and the horse's temperature could rise to an unsafe level. Research prior to the 1996 Olympic equestrian events in Atlanta showed that a safe, efficient way to cool off a hot, sweating horse is to hose on cold (not warm) water and to quickly scrape it off. The cold water pulls the heat out of the horse's body, warming the temperature of the water now sitting on the horse, so it needs to be removed.? When the water on the horse finally stays cool to the touch, it's OK to scrape it off and then stop hosing.