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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.
Mix equal amounts of white vinegar and store-bought fly spray in a spray bottle. Shake well before every use and spray the horse. The Results. We feel like this semi-homemade fly spray recipe worked just as well to keep house and stable flies from biting our horse as when the store-bought fly spray was used alone.