My dog has sensitve skin. The chemical filled flea/tick collars and the pills, made him scratch so much he sometimes would bleed. I had to try something. So I read about the best essential oils and natural things to treat pets with. This works really well to keep pests off your pet.  If you are looking for something a little stronger, to kill fleas and ticks then check out my Bugs Away! Plus He's chemical free now and smells better too, (which doesn't make him happy, but it makes me happy!)