I'm so sorry to hear about all of this. UCONNGSD has a dog with CRF and is a wealth of knowledge. You should contact her. My GSD, Brody, has had some kidney damage from what, we have no idea. I check his levels every 3 months. He's not in per say "renal failure" just yet and my goal is to keep him out of that. But, I've been doing my own research via the yahoo kidney diet group, dog awareness, and uconngsd. The biggest thing is the diet and supplements. COQ10 is an excellent vitamin for reducing creatinine levels, new studies are showing. Omega 3's are good for preventing further damage to the kidneys, along with vitamin e. I also have Brody on Renal essentials vitamins from vetriscience. Sub Q fluids are good for assisting in flushing out the toxins. But all of this depends on the dogs levels. Do you know what bloodwork numbers are? Also, depending on the numbers, depends on the protein level in the food. For Brody, his levels aren't horrible so I can still feed a decent amount of protein. Once levels are at a certain point, lower protein is better. But phosphorous is a key element you want to keep an eye on. Green Tripe like someone said above is excellent. Another thing is a calcium/phosphorous binder. Again, it depends on what levels your dogs bloodwork is showing. I would highly recommend talking to uconngsd. Her dog was diagnosed at 8 months old with CRF and is almost 4 years old I'm pretty sure. There is a wealth of knowledge out there, you can join me in learning!
Brody: GSD May 2010 Von der Sauk
Zella : Pitbull, July 2006
Fritzy: GSD February 2008
Pita: Cavalier July 2011