Farnam Mosquito Halt Spray for Horses Mosquito Halt spray provides quick knockdown, killing and repellency of mosquitoes while controlling gnats and face, stable and house flies Controls mosquitoes, gnats, face flies, stable flies, house flies, mites, chiggers and lice For use on horses, ponies and foals Contains Permethrin, Prallethrin, Piperonyl Butoxide, Technical, N-Octyl Bicycloheptene Dicarboximide, Di-n-propyl Isocinchomeronate and Butoxypolypropylene Glycol Available in 32 oz. ready-to-use spray and gallon sizes