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I am sorry to hear your cat has kidney disease. My name is Rebecca. I am a veterinarian and will do my best to help.
I do agree that starting on a kidney diet is a good idea. Which one are you trying?
Has a urinalysis been done? We can learn things about the kidneys from urine that we can't learn from blood tests alone.
There is a supplement, actually a probiotic called Azodyl that helps some cats with kidney disease feel better.
I would check for other things that we see with kidney disease, like her potassium and phosphorus. Potassium supplement and phosphorus binders might help if these levels are abnormal.
What to expect from here could be very variable; every cat is different. I have seen cats have better numbers after a few months treatment. I have seen cats live for many years after being diagnosed with kidney disease, but I have seen other cats that did not do so well. Every case, every cat is different.
Let me know if this is helpful and what other questions you have.
I did not hear back from you! I hope you were able to see what I wrote. Let me know if you have any more questions.