Zodiac Spot On Plus Flea & Tick Control for Cats & Kittens 5 Pounds and Over, 4-Month Supply. Kills fleas and deer ticks for up to 1 month. Kills and repels mosquitoes for up to 18 days. Kills flea eggs for up to 1 month. Stops flea life cycle and prevents reinfestation. Pet Specifix applicator shape helps prevent misuse on dogs