Are you opting for any treatment?
Unfortunately, outlook is pretty bad without treatment, which is quite costly. Kidney failure is slow and painful, so you want to watch your baby for signs of pain, so you can make the decision when it is needed. Below is a weblink for you to read that tells you all about kidney failure in dogs, treatment options, and what to look for. You can discuss this with your vet to come to a conclusion. I wish you all the best of luck with your baby and you might even consider having more testing done just incase there was a mistake...its happened :)
I would like to thank you for your help. khan is 8 years old[english bull terrior] but he never yelps or shows us he is in pain since he was a pup he is a very strong dog, even when i give him a hand in the car [vet said the kidney is so far gone] surely he would yelp, he still runs up hills, jumps like any other healthy dog.