How do flea collars work?

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I’ve seen several ways to prevent pets from getting fleas, but I find them all confusing. How would a collar stop a flea or tick from latching onto your foot?

In: Biology

The collar produces a scent that ticks don’t like. Since the ticks do not like the scent, they don’t bite you or the animal the collar is on. Others like mosquitos work in a similar way