subject: Frontline For Cats [print this page] The best thing about using this product is the raving reviews it gets. You don't need to rely on a scientist opinion, or speculation, since real people all over use it and are immediately amazed at the fact that Frontline for cats and dogs both actually work 100% guaranteed. A simple drop of the treatment will literally kill every single flea in your home, while it's recommended you continue the treatment for at least 3 - 4 months to make absolute sure their all gone.