Canine arthritis

Our old chap Twister is finding things more and more difficult having pretty bad dysplasia of his hind legs, with the arthritis that entails. As our house, like so many here, is "upside down", with the living rooms up the stairs Twister is reluctant to come up stairs. Many will say "well leave him down", but as he sits at the foot of the stairs whining and barking it is not the best solution.
 Are there any  suggestions? We have pain killers for bad episodes, but would like a more long term solution.

solutions to taglines82@gmail.com