Advantage Spot On Flea Control For Cats Under 9 Lbs. sold as single one month application. Advantage may be the fastest, most effective spot on treatment for fleas. It does not kill ticks. Do not use any flea shampoo, spray or collars on your cat when using Advantage. Do not allow your children to pet or hug your cat at the application site for about a day after applying. Do treat your home with premise spray if you have had fleas.