Hartz UltraGuard Plus Flea and Tick Drops offer complete protection and prevention against fleas and ticks. Fleas can lay up to 50 eggs a day, so it’s important to use a formula that breaks the flea life cycle. Hartz UltraGuard Plus products contains insect growth regulators (IGR) which kill flea eggs, larvae and pupae to halt current infestations and prevent future reinfestations. Topical drops provide protection in a convenient once-a-month application. Applicator is easy-to-use; simply press and twist to activate the topical applicator. Be sure to always use dog products on dogs and cat products on cats; they cannot be used interchangeably. Hartz UltraGuard Product Comparison Hartz UltraGuard Hartz UltraGuard Plus Hartz UltraGuard Pro Kills Adult Fleas and Ticks for Immediate Results X X X Kills Flea Eggs, Larvae and Pupae to Prevent Reinfestation X X 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 to stopping the flea life cycle. Hartz UltraGuard Plus and Hartz UltraGuard Pro products quickly kill fleas and ticks and stop the flea life cycle -- halting the 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.