Thanks so much for the info and comments everyone. Lottsa reading ahead. Like I said he's just at the beginning stages and apparently most cats that live long enough eventually have to deal with kidney disease or kidney problems.
Today we tried some wet (medi cal kidney) for the first time and Zig could not be less interested. We even mixed it with some kibble...I see a link on converting kibblers, so that's the first one I'll read. I also see there are good and better foods...the problem is availability I guess. My vet only sells (for cats with crf or kidney problems) medi cal and science diet k/d.
If anyone has any links on good places to purchase these foods....(in canada for me and the USA for others) it would be most appreciated.
Thanks again all.