Answer

Hello and thanks for researching this very important question!

The foods you have suggested may be cooked and offered in small amounts...too much change too quickly can cause digestive upset, so go slow.

It does not seem clear whether your pet's kidney is failing itself, or if it is reacting to the "mass" found nearby. If both of his kidneys are aging and "naturally" losing their filtering ability, then you will need to manage him day-to-day from now on.

Cats with kidney disease should have blood tests run to find out exactly how much renal function is left, and to determine if other metabolic problems exist.

If too much nitrogen (a metabolic by-product) is building up in his blood, he will feel sickly and have many problems with his digestion and even brain function. There is a new supplement that has shown good early results with cats.

Some cats with kidney disease have trouble with too much phosphorous in their blood and/or not enough potassium. Supplements can be used to address these problems as well, but you should make sure that his body needs them...find out what his blood test results say about these compounds.

Read about basic supplements here.

One of the jobs the kidneys do is to kind of "count" the red blood cells. Once red blood cells fall below a "set" point, the kidneys secrete a hormone that tells the bone marrow to make new blood cells. When the kidneys are sick, they can lose this ability. Anemic cats can be treated with hormone injections as needed. This therapy is tracked with periodic blood cell counts.

If he seems like he's having a hard time with appetite, make sure he is not anemic first, then discuss whether some antacid medicine might be helpful. Nitrogen in the body can damage the digestive linings and make the stomach and intestines very sensitive and even ulcerated.

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