If they're just not functioning due to infection or something else there are treatments. My girl was born with malformed kidneys so there wasn't anything to be done. She just always drank like a beast and when they started to really shut down I had to make that painful decision. Here's a link that a person actually put up some good info. I usually don't go by these but this person actually seemed to know what they were talking about:Rubella is there a treatment for that?
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Dog with kidney failure - is IV fluid the right solution? - Yahoo! Answers
It could very well NOT be a kidney problem but I mentioned it because my girl presented the symptoms you listed except she never drank her pee.
Best wishes and I hope it turns out to be nothin serious.