-NEXTSTAR flea and tick for dogs is your easy-to-use topical application that kills fleas and ticks for up to 30 days - NEXTSTAR dog flea treatment kills ticks and stops reinfestations by preventing flea eggs from developing into biting adults - NEXTSTAR Flea & Tick Topical for Dogs provides effective dog flea and tick control for 30 days with just one application. This fast-acting waterproof topical kills fleas, ticks, mosquitoes, chewing lice, flea eggs, flea larvae, and prevents the development of flea pupae