Sentry Natural Defense Natural Flea & Tick Spray kills fleas, ticks, mosquitoes and other unwanted pests for up to four weeks, yet it’s safe to use on your pets and around your family when applied as directed. Each bottle contains 8 oz. of natural active ingredients such as peppermint oil, cinnamon oil, lemongrass oil, clove oil and thyme oil.undefinedundefinedHow Does ...