We recommend prescription, spot-on products for ease and safety. If your cat does not tolerate a spot-on treatment (has a skin reaction or gets irritable after application), we recommend monthly oral Comfortis or a Seresto cat collar. If your cat has lots of fleas and flea dirt, we recommend bathing and drying before any flea product application. Our doctors recommend using Bravecto, Activyl, Revolution, and Advantage for topical flea treatment.