Our lab is gettin on a bit now so we restrict her to being downstairs only and another reason is because our whole house is wooden flooring so it would be too dangerous for her to be up and down it all the time, but if she ever did sneak upstairs we used to take her downstairs slowly holding on to her collar while she came down so she wouldnt fall of slip, if you want your dog to stop using the stairs you could buy a baby gate to put at the bottom of the stairs and give him a treat when you come back downstairs