I think my friend who is a day practice vet. said Frontline does not work as well on cats as it does on dogs (sorry I don't keep up with flea stuff). I would get Revolution (which has protection against heartworms as well) or advantage. Never use over the counter Hartz products-they are in hot water with the FDA and have agreed to remove all products in the next few months.
I will ask my friend again about Frontline and cats.
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