My horses are blessed with great pastures. My mare maintains weight perfectly. My gelding is OVERWEIGHT. I bought a grazing mask. Can I hear opinions. A friend of mine said to use it 8hours a day. I have had it on him a couple of times so far. He is dealing with it fine. I hope with riding, riding, riding, and the muzzle for consumption control, he will trim down a little. So far, the only con I have heard is that they can be rough on them and they don't hold up. I bought a best friend model. It seems pretty sturdy.