NOW Pets Flea & Tick Spray is a DEET-free, synthetic-pesticide-free repellent using geranium, lemongrass, peppermint, cinnamon, cedarwood, and thyme essential oils. For external use on dogs only — the label does not cover cats, and many essential oils in this type of formula are not safe for them, so do not use it on or around cats. Avoid the eyes and face, don't use on puppies under 12 weeks, and ask our staff if you have questions about fit for your pet.