Zodiac Spot-On Plus Flea & Tick Control for Cats and Kittens takes care of your cat by repelling and killing fleas, flea eggs, ticks, and mosquitoes, one month at a time. This simple, spot-on treatment has a special ingredient that stops the flea life cycle in its tracks by preventing eggs and larvae from moving on to the next stage. It also kills them. Zodiac Spot-On Plus is like arming your cat with a full on arsenal to fight off fleas, ticks, and mosquitoes. Take the war to them with Zodiac.