(Horse Health) Ambush Insecticide & Repellent is a ready-to-use insecticide spray for horses and dogs. Kills and repels stable flies, horse flies, face flies, deer flies, house flies, horn flies, mosquitoes, gnats, chiggers, ticks and lice. Kills and repels fleas, ticks and lice on dogs. Ambush Insecticide & Repellent is a non-oily, water-based pyrethrum formula. Contains 0.10% permethrin, 0.05% pyrethrin and 0.50% piperonyl butoxide.