My Firbi started apparent kidney problems just as I was setting off for Australia - the vet put him on Hill's to hold him until I got back 17 days later and could discuss it further. Marvin was dog-sitting (obviously he wasn't left alone or kennelled).
I took him in for further blood tests the day I got back - and the diagnosis was confirmed. Deterioration was rapid and he was starving himself rather than eat Hill's. The vet said there was nothing to be done anyway and so give him whatever he fancied to eat.
What he wanted was his normal diet with additional zuccini, marrow - any form of squash. Back eating with the rest of the pack, we were down to four at that time, Firbi even gained a tiny bit of weight. I think he hadn't liked being singled out for a special diet. Wanted to feel he was part of his pack. The end came some 6 months after I got back from OZ. He was only 13.
On a happier note, Debradownsouth is back !