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.

Spring is just around the corner, and arriving with the more pleasant weather are those most unpleasant pests: fleas and ticks. If you have pets, you’ll want to protect them from the discomfort and ...