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Another option is to mix small amounts of apple cider vinegar with the animal's drinking water; consuming this solution is known to change the blood pH of the horse, thus keeping horseflies away. Cider vinegar, coupled with essential oils, is also used in home sprays as the sharp odor may repeal horseflies.
Homemade fly spray recipes that may work for you and your horse. U.S. Forest Service Bug Spray Recipe. 1  1 cup Water. 2  1 cup Avon Skin So Soft Bath Oil. 3  2 cups vinegar. 4  1 tbs.