Thank you so so much for your comments and it is good to read (even though a sad story) that dogs with these conditions and medical setbacks can live to get old bones. It is something we discuss alot in our house with Zak and cats that have had vrious serious health issues. We don't let Zak run around of lead like a loony bin he is incase it causes a relapse but try and balance a good dog life for him. We don't treat him the same as the other two dogs as we are aware that he is his own worse enemy but have now seemed to of found a happy balance with all three dogs. They all now have low fat food none of them get any human treats and Zak is seperated at feeding times so he doesnt get to see them have there dentastix's lol. We want him to have a long life but also a happy dogs life without putting him in cotton wool. Having said that when off lead he wears a DO NOT FEED hi-vis jacket and when on a kids playing field area off lead we sometimes muzzle him just so he cant find something he shouldn't eat on the field. Zak has taught us alot about being dog owners as well as learning how to deal with his various illnesses but most importantly patience with these things. There is no quick fix with these illnesses it takes time and alot of research and the invaluable daily diary which helped keep a constant log of how his body was coping with it all. I always read this forum and feel for the people who haven't got to the stage we have yet and I watch Zak everyday for any changes as they can happen so quickly but am very thankful that he is for the moment as healthy as he can be with the illnesses.