Overweight horses often can’t perform at their best and are prone to conditions such as equine metabolic syndrome. Yvette Nout-Lomas, DVM, PhD, Dipl. ACVIM, ACVECC, an associate professor of Equine Internal Medicine at Colorado State University’s Veterinary Teaching Hospital, explains how introducing lower-calorie feed options and adjusting hay and feeding methods, such as using slow-feeders and changing from alfalfa to grass hay, can help keep your horse at an ideal weight.