TropiClean Natural Flea & Tick Maximum Strength Shampoo for Dogs kills fleas and ticks by contact. Formula contains some of natures most powerful pest fighting ingredients and is maximized with lemongrass oil for long-lasting repellent effects. When used as directed, shampoo is suitable for routine pet baths and helps to repel pests for up to 7 days. TropiClean Pet Products are cruelty free. 20 oz.