with my veterinary medicine background, and a seminar on frontline, the safest product out there is frontline. the key ingredient in this product is called fipronil. fipronil is a chemical that is used to treat head lice on children in england. to assure you are getting frontline, purchase only through the vet. there are flea and tick products out there that display "frontline" with a sub-language in french, this is the canadian product that is not the same.
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