Safer Brand Critter Ridder Ready-To-Use Animal Repellent is an effective dual-action repellent that uses ingredients such as dried blood, putrescent egg and garlic to create an unpleasant environment. It repels by irritating the animals sense of smell and taste so they seek food and shelter elsewhere. For your convenience, Critter Ridder is also easy to use. Simply point the bottle in the designated area and spray. The formula repels cats, dogs, skunks and more. 1 bottle covers up to 320 sq. ft. and protects against nuisance animals for up to 30-days, leaving more time for you to enjoy the comfort of your outdoor space.