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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.
As one more way to keep mosquitoes away from you and your yard, try planting these attractive plants. HORSEMINT. Horsemint has a scent similar to citronella. Horsemint grows wild in most of the Eastern United States, from Mexico, Texas up to Minnesota to Vermont.