“The body weight is so important when you are determining how much to feed horses each day,” he said. “A 1,000-pound horse needs to eat 2% of its body weight each day, so about 20 pounds of feed. It doesn’t seem like a lot of hay, but if you underestimate your horse’s weight and buy 100 days’ worth of hay for a 1,000-pound animal that actually weighs 1,200 pounds, you’ll be short by more than eight bales per horse.”