Did dry food cause my cat's kidney disease?

There's no good evidence that it did. Whether canned is better now that she has it is a separate question, and there the answer is yes, for the water. Lifelong dry-fed cats often never get this and canned-fed cats often do, so put that particular guilt down.

Did vaccines cause my cat's kidney disease?

A normal vaccination schedule is not why she has this. There is laboratory work showing some vaccines grown on feline kidney cells can raise antibodies against kidney tissue, which is a real finding and worth studying, and it has never been shown to produce clinical kidney disease in a cat. Age outweighs it by an enormous margin.

Is kidney disease in cats hereditary?

In a few breeds. Persians, Himalayans and British Shorthairs carry polycystic kidney disease, which is inherited and can be tested for. Abyssinians, Somalis, Siamese and Maine Coons run higher rates of other kidney problems. In an ordinary domestic shorthair, genetics probably play a part and there's nothing to test.

Could my other cats get it from her?

No. There's nothing transmissible about an organ wearing out. If your others are past about ten, screen them at their next visit anyway, because the main risk factor is age and they have that too.

Is there anything I could have done to prevent it?

Very little, realistically. Keeping true lilies out of the house entirely is the one measure that saves cats outright. Yearly blood and urine on an older cat prevents nothing either, but it changes how well the years after the diagnosis go.

Why did my cat get this?

Q: What causes chronic kidney disease in cats?

In most cats, nothing anyone can name. Age does the bulk of it: common past ten, very common past fifteen. The nameable contributors are inherited disease in a few breeds, a past blockage, kidney infections, toxins like lilies and antifreeze, high blood pressure, and years of untreated dental disease.

What causes chronic kidney disease in cats?

Most people arrive at this question for one of two reasons. Either you want to understand what happened, or you're quietly checking whether it was your fault.

If it's the second one, I'll answer that first: almost certainly not. The single largest factor in feline kidney disease is age, and you didn't cause that.

A worn leather collar with a blank metal tag lying on a wooden dresser in late afternoon light.

Age, which is most of it

Chronic kidney disease is common in cats over ten and very common in cats over fifteen. Kidneys are working filters with a finite service life, and cats now live long enough to reach the end of it.

That's genuinely most of the explanation. It's also the least satisfying, because there's nothing to blame and nothing to have done differently.

How common this gets with age Not measured data. The only claims on it are the ones the page already makes: common past ten, very common past fifteen. Kidneys are filters with a finite service life, and cats now live long enough to reach the end of it.

Was it my fault?

Video coming. I'm filming these myself.

The things that do contribute

Where we can identify something, it's usually one of these.

Known contributors

What we can sometimes pin it on

Inherited disease, in certain breeds: Persians and related breeds carry polycystic kidney disease, which is inherited and testable. Abyssinians, Somalis, Siamese and Maine Coons have higher rates of other kidney problems.
A past urinary blockage or severe urinary disease: Especially in male cats. A blockage backs pressure up into the kidneys, and the damage doesn't fully undo.
Kidney infections: Pyelonephritis, sometimes never diagnosed at the time because cats carry it so quietly. Each episode costs tissue.
Toxins: Lilies are the notorious one and they're catastrophic in cats. Antifreeze, some human medications, particularly anti-inflammatories, and certain plants.
High blood pressure: It damages the small vessels inside the kidney, and it can be both a cause and a consequence. It's also treatable, which is why it's worth measuring.
Long-standing severe dental disease: There's a plausible association through chronic inflammation. It's a softer link than the others and it's a reason for dental care in a young healthy cat, not for anesthesia in a kidney cat.

The dry food question

This one deserves a proper answer because it's where most of the guilt lives.

There's no good evidence that feeding dry food causes kidney disease. Plenty of cats eat kibble their whole lives and never develop it. Plenty of cats eat canned food exclusively and do.

Here's the distinction that gets collapsed, and collapsing it is what generates the guilt:

Did dry food cause this? No good evidence that it did.
Is canned better now that she has it? Yes, clearly, because of the water.

Those are two different questions with two different answers, and the internet routinely answers the first one using the evidence for the second. A kidney cat can't concentrate her urine, so she's losing water constantly, and canned food puts some of it back at every meal. That's a management fact, not a causation fact.

So if you're sitting on a decade of dry feeding and feeling responsible: put it down. It isn't yours to carry. What to feed her now is on the kidney diets page.

The vaccine question

I'll give you the real state of this rather than either dismissing it or feeding it.

There is laboratory work showing that some vaccines grown on feline kidney cell lines can prompt cats to produce antibodies against kidney tissue proteins. That's a genuine finding, it was worth publishing, and it's worth further study.

What has never been shown is that this causes clinical kidney disease in cats. Producing an antibody in a lab assay and losing kidney function in a real animal are a long way apart, and the studies that looked for the second thing haven't found it.

Meanwhile the factor with overwhelming evidence behind it is age. So no, vaccinating her on a normal schedule is not why she has this.

What is reasonable, and what I do anyway, is to vaccinate according to actual risk rather than reflex. An indoor-only fifteen-year-old with kidney disease does not need the same schedule as an outdoor three-year-old. That's a conversation worth having with your own vet, and it's a conversation about her, not about a conspiracy.

The ones that come up and don't hold

Tap water. Municipal water isn't causing feline kidney disease. If your water is safe for you it's safe for her, and a filter is a comfort purchase rather than a treatment.

Too much protein over a lifetime. Cats are obligate carnivores built to run on protein. Restricting protein has a role once the disease is established, and even then only moderately. A high-protein life didn't do this.

Stress. It doesn't cause kidney disease, though it can make a cat with kidney disease look worse.

Getting her spayed, microchipped, or anesthetized once years ago. No.

The two things with actual prevention value

Small list, but it's real.

The one cause you can actually prevent

Keep true lilies out of the house.

Not out of reach. Out.

Lilies True lilies, all parts, including pollen groomed off a paw. If somebody sends you a bouquet, check it. Not out of reach: out of the house.

Screen older cats yearly, with blood and urine, from about age eight or ten. Screening doesn't prevent the disease, but SDMA and urine concentration move early, and a cat caught in stage 1 or 2 has far more room than a cat caught in stage 3. This is how most cats on this site got diagnosed while apparently perfectly well.

If you have other cats over ten, that's the practical action item from this page. Not because they can catch it from her, which they can't, but because they share her main risk factor.

What this changes

Practically, not much, and that's worth saying out loud. Knowing the cause wouldn't change her treatment, because the treatment addresses the consequences rather than the origin.

What it changes is the story you tell yourself. And the accurate version of that story is that an old cat's kidneys wore out, you noticed, and you're now doing something about it. That's the whole of it.

The useful next page is either what CKD actually is if you want the mechanism, or the seven practical steps on the start here page if you'd rather get on with it.

Medically reviewed by Dr. Steve Pelton, last updated August 26, 2026. First published July 25, 2026. Reviewed quarterly.