Hartz Shampoos and Sprays Fresh-scented spray kills fleas and ticks on contact for up to 7 days, plus prevents re-infestation by stopping flea eggs from hatching for 1 month Includes a 16 ounce spray bottle Enriched with aloe to provide soothing relief from itchy, irritated skin Can be used weekly for preventative treatment For dogs and puppies 12 weeks of age and older