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Use vinegar as a natural fly spray for your horse. You can use 2 cups of vinegar with 1 cup of water and 1 cup of Avon Skin So Soft bath oil mixed with 1 tbsp. of Eucalyptus oil. You can also add a tbsp. or two of citronella oil to this mixture. Shake it well and then spray on your horse.
Mix the ingredients in a 32 ounce spray bottle. Shake well before every use and spray the horse. The Results. Like recipe #1, above, this homemade horse fly spray worked well around the barn and house, but was of no help in the pasture for deer flies. How Long It Lasted. Also like recipe #1, above, this fly spray lasted between 45 minutes and an hour.