Farnam Repel-X Insecticide & Repellent is a ready-to-use, water-based fly spray that has been trusted since 1957 It kills and repels stable, horse, face, deer, house, and horn flies, as well as mosquitoes, gnats, ticks, fleas, chiggers, and lice It can be used on horses, dogs, and their surroundings and contains pyrethrins, piperonyl butoxide, technical, and permethrin for effective pest control, applied as a spray or wipe-on