Sentry Natural Defense 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. The exclusive formulations that feature these ingredients are harmless to mammals, birds and fish — but they’re deadly to biting pests. Each easy-to-use spray bottle features natural active ingredients such as peppermint oil, cinnamon oil, lemon grass oil, thyme oil and eugenol. Veterinarian tested and approved, Natural Defense kills and repels fleas, ticks and mosquitoes with natural ingredients.