The Pet Gear Easy Step IV Pet Stair with its 6 high and 9" deep steps (overall height of 30.5") enables dogs to comfortably climb stairs. The Easy Step IV Pet Stair provides smaller dogs the ability to get their body one each platform. The innovative inclined design reduces the number of stairs needed to climb, easing stress on your pet. Top step depth measures 9.5", the second step depth measures 9", and the third step depth measures 9". The Pet Gear Easy Step IV supports up to 150 pounds.