They seem to work well and my cats don't mind them, but I've found a few fleas here and there after opening a new one. For a year or so of use through three purchases I would say they are 70-80% effective or so. They are a great long-term solution compared to the alternatives, but I wouldn't use them for several years as there are better alternatives for immediate treatment.
Seresto Flea And Tick Collar For Small Dogs (Up To 18 Pounds) - 8 Month Protection (2 Pack)
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