Best Friend Grazing Muzzles can prevent, as well as treat, laminitis, founder, obesity, colic and other diet-related diseases. The small opening in the bottom allows horses a limited amount of grass, yet unlimited water. Rather than being restricted to a non-grass environment to control intake, horses are free to exercise and socialize as part of the herd. The lightweight muzzles resist rubbing and chafing and will not rot. It easily attaches to your horse's turnout halter.