Horse owners know it takes more than a few different tricks and products to maintain a true No-fly Zone. Farnam Fly Spray provides proven protection for horses dogs and premises. This Equine Fly Spray is a ready-to-use water-based formula with citronella scent. Farnam Fly Spray kills six types of flies (stable horse face deer house and horn) gnats ticks fleas chiggers and lice; it also repels blood-sucking mosquitoes.