Sorry about your girl having kidney failure :( Do you know what her levels are? My 4 month old puppy is in kidney failure as well (just diagnosed a week ago), so I"ve been doing a lot of research. www.dogaware.com has a huge amount of info on kidney disease, diets & supplements, as well as the the link already mentioned above. Are you working with your vet as well? I'm still working on a good homemade diet for my TJ, but he's on a prescription food & meds right now.
Yahoo also has some good canine groups
Here is this forums largest thread on Kidney disease.......I hope it helps you out......We have many other threads, too if you want to do a search..........Karla
http://www.medhelp.org/posts/Dogs/4th-stage-renal-failure-in-my-dog/show/425814?page=1