Natureworx Horse Guard offers natural relief from irritants and fly-infested ears.Natural Pyrethrum and essential oils help guard against flying, biting annoying insects. Natureworx Horse Guard is DEET FREE and TOXIN FREE.Horse Guard has a long lasting residual effect which means you only have to reapply as needed making it amore economical solution.Horse Guard is suitable to be used on a variety of medium to large sized animals.Spray Horse Guard around stables, sheds, outbuildings and bedd..