I wish I could say that I know the science behind them but I sincerely don't believe they would work at all. It's not like they cover every inch of your pet.
I just looked it up, it's so expensive!! I wouldn't pay that amount for it. My favorite pet store that's focused in the holistic area doesn't say that's the highest protection. It only protects around the neck area, you should use a flea protector spray instead..
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