Hartz UltraGuard topical liquid products for cats all contain the active ingredient etofenprox. Etofenprox is classified as a synthetic non-ester pyrethroid that is effective against fleas and ticks.

When the sun is shining and the trails are calling, nothing beats outdoor adventures with your pup. But as fun as nature walks, dog park visits, and backyard playtime can be, they also bring a hidden ...