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Sarah from Middlesboro, Ky writes

Why does my dog have fleas on him after wearing a Seresto Dog Flea and Tick Collar for several months?

My dog has wore the collar almost 4 months now, I have never had a problem with it until now I have started Noticing several fleas on him and I don’t know what’s wrong


Even though the Seresto Dog Flea and Tick Collar continues to work for 8 months, it is not a complete repellent during that time. Fleas and ticks will still need to bite to consume the active ingredient, so it can take several hours for them to die. Be sure that you are still checking outdoors and treating as needed so that the dog is not bringing fleas and ticks indoors. You can also use an additional repellent on the animal if needed for long walks outdoors or in areas that you cannot treat. We have more tips in our Flea Treatment Guide here as well.

Answer last updated on: 08/27/2019

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