A better approach is dusting ONLY FOOD GRADE Diatomaceous Earth(DE) on cuffs and waist line. Some dog breeders sprinkle a bit into feed for dogs to detoxify internal parasites and sprinkle on coats and around bending to control fleas and ticks rather than apply chemicals. I use it in my home and garden to control cockroaches, fire ants, fleas, ticks, slugs, snails, sow bugs, and earwigs. If dust brushed on clothing around insect pts of entry it has to be used in dry weather.