Barked: Sat Dec 1, '12 10:04pm PST |
 |  |  |  | I work as a professional dog trainer, and I've actually heard this a lot. I'm wondering if people just aren't using is properly. However, one of my client's dogs has been on Frontline for two years and suddenly it stopped working. My personal experience with Frontline is somewhat mixed. I've used it on my dogs for a long time and it has worked just fine. Unfortunately, I decided not to put flea medication on last winter and the dogs got infected, and Frontline didn't kill the fleas! My sister told me that Frontline stopped working for her cats. A fellow professional dog trainer told me that it has stopped working in our area. My vet thinks that fleas are becoming immune to Frontline. I asked friends on Facebook if Frontline worked for them, and most of them told me that it didn't. So, I think it is probably the product itself that is not working, not that people aren't applying it properly. |  |  |  |  |
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