Horse tail bags, braid-in tail bags, and tail wraps will protect your horse’s tail from the sun, manure and mud-the main cause of dry brittle tail hair. Three tips for fast tail growth. First, healthy hair starts with good nutrition. Make certain your horse is fed high-quality hay and is getting sufficient vitamins and minerals. Second, use only brushes specifically designed for manes and tails. Third, protect your horse’s tail. Shampoo, condition, braid and insert into a tail bag. Your horse’s tail will stay clean and protected.