We had a very lively Boxer named Caesar. Sitting in a place was totally alien to his nature. During his growing years he was a competition to all the boys in our neighbourhood. The moment they came out to play, it was prerogative that he joins them.
Being so active all his life we were totally unprepared to see him slowly turn immobile as he aged over the years. We saw him gradually having difficulty sitting, standing, jumping and doing things that were a part of his personality.
On our vets advice we started supplementing his diet with glucosamines. The result took a little time but it sure was there for all to see. His comfort level and mobility improved considerably. Glucosamine was a part of his diet till the end.