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Review title: Frontline did not work
Product review: I have been using Frontline on my dog for 3 years and it has always worked as intended, until now. This time it did absolutely nothing to control the fleas on my dog. At first I thought it was just taking longer than usual to work, but it never did kill a single flea. I asked around and many people have experienced similar problems with Frontline. One person described it as, "Either the fleas or the dogs are becoming immune to Frontline." It was suggested to me to try Advantix next....
