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I am pretty sure Frontline is the least toxic to the animals. Can be used on either cats or dogs just in smaller doses. It is also the most expensive. I almost killed one of our cats using a small amount of bio spot for a dog on it. Good luck in your search as I would try a green product. I am using Frontline this year again. I have never had great luck keeping ticks off my dog. A daily pat down and zircron encrusted tweezers is what I find that works the best.Lets us know how you do. Thanks P.
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