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Review title: Stoped working.
Product review: I've been having major problems with Frontline since this summer (2009), when I first noticed that it was no longer effective and that within 3 days after application there were still fleas on my cats. I've used it for years and have always been very happy with it, and then it seemed that it suddenly stop working. I contacted my vet and was told that they had been receiving other complaints about Frontline failing, and mentioned that there was some concern about possible flea immunity to the product. Regardless of the potential reason, I have found a substantial community online with the same experience that I've had.
