We used the Seresto collars on our french brittanys a couple of years age. My wife is a vet. tech., so we know we had the real thing. The dogs didn't have any problems with the collars. (The good thing about the collars is if the dog has a reaction you can take it off.) In our case, I'm the one that had THE REACTION. If I fell asleep, with one of the dog's collars against my arm, I'd awake with an itchy red rash on that arm. Quite using the collars, problem solved. Now we are using Revolution (Selamectin topical).
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