Natural Flea & Tick Shampoo with Oatmeal for Dogs contains natural botanical ingredients that work synergistically with one another to provide effective and natural flea protection. Natural Flea & Tick Shampoo with Oatmeal for Dogs has been proven to provide a residual effect for up to 7 days and is also effective on black flies and mosquitoes. ?Another added benefit is oatmeal proteins which moisturize, nourish and revitalize dry coats.