Hello. Canine kidney disease presents owners with a complex set of issues, symptoms and management options. While there is no cure, there is so much you can do to prevent further damage to the organs and, in many cases, both improve quality and quantity of life.
As a relatively young dog, the first question would be what is causing the kidney issues? Has your vet considered this? Has he said whether it is chronic or acute? If it's acute, then urgent treatment is required. If your vet doesn't know the answer and seems unable to find out - get a 2nd opinion from a more experienced and knowledgeable vet. And one that is familiar with canine kidney disease. You can approach a nearby veterinary university or college, who will probably be able to give you contact information. I think this would be my first task, if my vet didn't seem pro-active.
Next question ... do you have the diagnostic blood and urine test results? If you do please post them so we can see what stage things are at - and that will help us offer better advice. If you don't have the results, get them, and don't take no for an answer - you paid for them, they are yours.
Did your vet undertake a blood pressure check on your dog? This is extremely important. Most kd diagnosed dogs have high blood pressure, and this makes deterioration of the kidneys a much faster process. Early treatment is therefore crucial. If there was no test undertaken, one is needed as soon as possible.
While you are dealing with those three issues ... I'm giving you a link to one of my articles that may help with understanding diet changes that may be necessary now - and will certainly become necessary soon. Please have a read of it and then ask any questions you may have.
http://www.infobarrel.com/How_Diet_Affects_Dogs_with_Chronic_Kidney_Disease
That's enough for now. Don't feel too downhearted. This can be a difficult and emotional journey, but we are here for support, and you have already started the process of understanding this disease ... and therefore being able to help your best friend so much more.
Tony