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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.
Submitted by Katie Navarra on. Homemade fly sprays can be an effective alternative to manufactured fly repellents for your horse. The key to successfully using homemade fly sprays is in understanding how to properly use the spray. You can't use fly spray (made with essential oils) once a day and expect it to work, Nan Martin, LSH, CRTS, founder of Experience-Essential-Oils.com said. You need to spray it often.. Common housefly = Horse pest.