Remember to measure for the perfect fit. The Best Friend Grazemore Grazing Horse Muzzle allows your horse some grazing, but also restricts his grass intake for weight management. It features large breathing holes for plenty of air circulation. A larger grazing hole in the bottom of the muzzle gives your horse some access to grass and feed, but it won’t restrict his drinking. The muzzle is made of a light grey webbing to help reduce heat absorption on bright, sunny days. Because horses can graze with this muzzle, it’s not recommended for horses with insulin resistance.