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I hate to undermine your vet but I agree with what you acknowledged that a low protein diet for CKD cats is old school unless the kitty is in the very last stages. The last several years, the research has shown it’s important to feed a high quality diet with 30-40% calories from protein.
Here is a good discussion with many literature citations to share with your vet. I’ve never fed my CKD a low protein diet and they’ve all lived a long time with stable CKD. This information comes from the gold standard on treatment of feline CKD called “Tanya’s Comprehensive Guide to Feline Chronic Kidney Disease”. There’s a lot of information to start digesting it slowly while her CKD is at a lower stage.
It’s way too soon to be giving
subq fluids. They are typically not started until the creatinine increases over 3.5. There are many reasons for this but one is that scar tissue can build over time with the insertion of needles and once that scar tissue builds, it makes it hard to get the subq fluids in. Another reason, and it’s one of great concern, is overwhelming the heart. Before I started with daily subq fluids when my cats’ creatinine got over 3.5, I had an echocardiogram done so we could make sure the heart was of normal size and functioning properly. Absence of a murmur is not indicative of anything. a cat can have advanced cardiomyopathy and not have a murmur. Conversely, a cat can have a grade 5/6 murmur and no cardiomyopathy.
Four of the most crucial things with longevity with CKD are (1) keeping the phosphorus level as low as possible by feeding lower phosphorus foods and adding binders when the P level gets to 6, (2) keeping an eye on urine protein so if proteinuria develops, it can quickly be addressed, (3) staying ahead of anemia, and (4) checking the blood pressure and keeping it under control.
There is no reason why you can’t do TR with a CKD cat. It’s really apples and oranges. Of course, if a cat is at the final stages of CKD and is anorexic, there is no need to do TR. At that point, it’s all palliative care.
I don’t know if you are open to feeding a balanced raw diet but the
one that many of us use here has lower P values (not
low as that only comes with the renal diets) but certainly lower than most canned foods. The raw meat is a good source of high quality protein. Yes, it’s a higher amount of protein but there are a lot of people with CKD cats feeding it.