•  Efficacy Owner Cat Dog

      Drops for Dogs

      Etofenprox, the adulticide active ingredient in Hartz® UltraGuard Pro® Flea & Tick Treatment for Dogs and Puppies, starts killing fleas within 15 minutes. View mode of action.


      Drops for cats

      Etofenprox is similar to a pyrethroid in action but its chemical structure is very different, and extremely well suited to cats. View mode of action.


      How They Work

      Parasiticides provide the most effective flea and tick control when the active ingredients include an adult flea-killing active AND an immature flea-killing active to break the flea life cycle.

      Many pet owners still do not understand that an Insect Growth Regulator (IGR) is needed to kill all stages of the life cycle to prevent reinfestation.

      Life Cycle of Dog Flea

      Female adult fleas begin to produce eggs after their first blood meal. On average, a female is capable of producing approximately 2,000 eggs during her lifespan.

      After being laid on the host, flea eggs fall off into the environment contaminating in bedding, floors and carpets.

      As eggs hatch, flea larvae are found in cracks, floors and carpets. Larvae feed primarily on flea dirt before transitioning to the pupal phase.

      Flea pupae can survive up to 140 days. When conditions are ideal (e.g., heat, moisture, vibration), they emerge and the cycle repeats.

      The active ingredients in Hartz® UltraGuard® Flea and Tick drops have been carefully selected based on their proven effectiveness in killing, repelling and preventing fleas, ticks and mosquitoes. We also give great care to select ingredients with low mammalian toxicity to further protect pets and their environment.