Chemfree Critter Ridder is made from a unique formula containing natural organic mineral and vegetable ingredients. It works on small animals by perturbing their sinuses. This creates an unpleasant, yet harmless reaction that conditions animals away from treated areas. Remains effective even in rainy conditions for up to sixty days. Use to deter dogs, cats, raccons, skunks, squirrels, mice, rats, deer, gophers, moles and other animals. To discourage raiding of bird feeders by squirrels!