Box stalls should be large enough to permit the horse to get up, turn around, and not lie in, stand in, or eat from areas contaminated with its own feces or urine. The recommended minimum area is 9 square feet per 100 pounds of body weight of the horse. The ceiling height should be a minimum of 1 foot above the horse's ears. For ventilation purposes, ceiling height should be higher. The typical box stall is 12 feet x 12 feet with a minimum height of 9 feet.