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These shampoos are formulated to kill different insects, and to be safe for very different species. Flea shampoos, though rarely needed anymore since infestation can be prevented/controlled with topicals (e.g., Advantage, Frontline, etc.), are designed to be safe for use on dogs and cats of at least a certain age. Lice shampoos are formulated to be safe for use on humans.

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16y ago

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