If you have horses you have flies and other biting insects, which are constant pests that irritate both horse and rider, causing stress and health risks with their ability to transmit diseases. Fly and insect control should be part of your daily care routine and repellents applied directly to your horse are the final line of defense between them and biting insects. FlyFree is a Natural Repellent. The horse has little choice in which products are applied to their body, they have a keen sense of smell and extremely sensitive skin, so a natural product will be preferred by most horses. When you use a natural product not only is it kinder and safer for your horse, but also for yourself, other people and animals around you.