Roto brushes are primarily used on leg hair. They can help alot,but they can also be dangerous!!. Tails can get caught up in brush. You should use extreme caution and have someone help if using for first time.I have had calves kick the bejesus out of me when I first tried using one. You need to have your calf really gentle if possible. Like I said,if used properly they can be of help to train leg hair. You can purchase from Sullivan Supply.