Becky, I'm so sorry about Auric. I lost my first cat to kidney disease. For better or for worse, she went rather quickly, so we were never in a management phase, but I've struggled since then with what to feed my cats, including a geriatric male who has refused to eat better quality wet food, making me resort to cheap canned food--which is still arguably better than dry.

I, too, have read the mixed verdicts when it comes to protein for cats with kidney disease. I tend to think that they continue to need protein, as they are carnivores. The most important thing is phosphorous reduction. Have you compared the phosphorous content of the Prowl with the prescription Hills? Like the others who have responded, I am leary of these brands when it comes to pet nutrition and it frustrates me that vets continue to push certain brands without a good understanding of pet nutrition. Just yesterday, I read a FB post from a vet who misstated, IMO, the role that a protein based diet plays in the development of kidney disease. But, there is a place for certain of Hill's products when it comes to kidney disease--if phosphorous regulation is your paramount concern. So, I wouldn't yet rule it out. Remember, too, that right food to feed Auric is one that he'll readily eat--so there's that consideration, too.

The best and most comprehensive information I've found on kidney disease in cats is this website. If you're not familiar with it, take some time to read the various topics. Perhaps it will help you in your dialogue with your vet and in managing Auric's illness.

Good luck; let us know what you decide.