I used the Miracle Collar for my Percheron/QH. It worked great for about six months, but then she learned to crib through it. Even set on the last hole, even after I punched a couple extra holes. I assume her having such a thick neck might have played a part in the collar not bothering her cribbing that much. It was definitely uncomfortable for her, that much was obvious. On a horse with a smaller neck, I'm sure it would work just fine. I do recommend getting the fleece pads too. Without them, the collar will eventually rub hair off and probably rub the skin raw.