I recently purchased Hartz First Defense for flea control since I have 5 cats and was looking for something a little more affordable that Advantage.
Is this product really harmful to my cats? I have been reading some on line information and it’s really scaring me to go back to Advantage. Could you give me an educated opinion on this product.
Our Vet Says:
Hartz First Defence has the same active ingredient as Frontline Top Spot. My personal opinion is to use Advantage or Advantage II. If you have a problem only with fleas it is better to use Advantage but if you have a problem with fleas and ticks you need to use product that has the active ingredient Fipronil.
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Our vet just recommending alternating flee products to add Advantage with the Revolution every other month. What is the difference between Advantage and Advantage II?...?
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