The Designer Stair III, with deep steps, boosts smaller dogs ability to get on platforms and climb stairs. Rubber gripping on the bottom holds the Designer Stair II in place. The specially designed steps reduce the number of stairs needed to climb, easing stress on your pet. Designer Stair II features removable carpet treads and designer cover, both machine washable. Top step depth measure 9.5", second step depth measures 9", third step depth measures 9" and step height measures 6".