Sergeant’s Green Natural Flea & Tick Squeeze-On, for Dogs & Puppies 15 to 40 lb, kills and repels fleas, ticks and mosquitoes for up to four weeks, yet it’s safe for use around children and pets when used as directed. Sergeant's Green is safe in multiple pet households, but should be applied to dogs only (never on cats).Each carton contains four monthly applications that feature natural active ingredientssuch as peppermint oil, cinnamon oil, lemon grass oil, clove oil and thyme oil.Sergeant’s® Green products are highly effective, yet they’re safe for use around your pets and your family when used as directed. Over hundreds of millions of years, certain plants have developed highly effective defense mechanisms against potentially harmful insects. Now, Sergeant’s has harnessed the power of these natural botanical extracts to produce a line of flea, tick and mosquito control products that features natural active ingredients such as peppermint oil, cinnamon oil, lemon grass oil, clove oil and thyme oil. The exclusive, all-natural Sergeant's Green formulation is safe to use around children and pets, but deadly to biting pests!