Thanks so much for all of your supportive posts. We think Endeavour must have done something to aggravate his arthritic condition. He cant jump up onto or off anything, but he has been doing a few semi binkies in recent days so that may have been what caused his increase in pain. Hopefully we can get him off the heavy duty analgesia over the next few days. Obviously if he needs them he needs them, but they wont do his kidneys any favours if used longterm.