Hartz UltraGuard Flea and Tick Drops offer affordable protection against adult fleas and ticks. With convenient once-a-month application, this reliable product kills fleas and ticks and repels mosquitoes. Includes formulas created especially for dogs or cats; these products are not interchangeable. Available is dosages appropriate for different sized pets. Hartz UltraGuard Product Comparison Flea LifecycleFor every visible adult flea there are many more flea eggs, larvae and pupae in the surrounding environment that you do not see. Treating infested areas as soon as the problem is recognized is vital in stopping the flea life cycle. Hartz UltraGuard Plus and Hartz UltraGuard Pro like powders, sprays and foggers quickly kill adult fleas and ticks and stop the flea life cycle -- halting current infestation and preventing future infestations. The UltraGuard CommitmentHartz UltraGuard provides affordable, convenient pest control for every pet. UltraGuard is committed to applying the latest science to effectively eliminate fleas, ticks and mosquitoes and to prevent them from infesting pets and their surroundings. Uncompromised quality is our ongoing mission. At UltraGuard, we recommend an integrated and complete approach to pest management. Our expertise in parasite protection ranges from on-pet topical drops, shampoos, and collars to in-home sprays, carpet powders, full-room foggers and in-yard sprays. Treating the whole problem is the key to a pest-free environment.