It can also be used as an area to groom horses out of the aisle or to hose injured legs and wounds. Plan for a minimum space of 8 by 12 feet with no windows or doors, a roughened-cement floor that slopes to a drain, and access to both hot and cold water. One handy option is an “overhead boom” water source, similar to those used in car-wash stalls, that eliminates the scary, snake-like hose coiling around your horse’s feet. To increase traction for both you and your horse, use perforated rubber mats.