Horse Lice Duster is extremely effective in controlling biting or sucking lice, horn flies and face flies on horses and ponies; also controls fleas, ticks and lice on dogs . Just dust Horse Lice Duster directly onto all parts of animal's body, working in dust by brushing against the lay of the hair to bring dust into contact with the skin. Horse Lice Duster is also ideal for treating animal quarters and bedding 6 oz. container.