Thanks guys. Frisky, my Siamese look alike, was a great cat and a good buddy over the last twelve years. I got him when he was four, so he lived a good sixteen years. I have had a range of emotions, from sadness, to guilt, to relief, and definitely second guessing myself - could I have done more?, could I have spotted the problem earlier? etc... But my buddy is at peace now and I am glad he is no longer suffering.