March 10, 2026 – If your cat is older than 10, chronic kidney disease is one of the most important health threats you should understand. Here's what the science says, and what Morris Animal Foundation is doing about it.
What is Chronic Kidney Disease in Cats?
Chronic kidney disease (CKD) is the persistent loss of kidney function over time. In cats, it is one of the most prevalent conditions of aging, and one of the most serious. Unlike many illnesses that strike suddenly, CKD develops gradually, often silently, over months or years before a cat shows any outward signs.
The kidneys are made up of thousands of tiny filtering units called nephrons. These structures filter waste from the blood, regulate electrolytes and fluid balance, and produce urine. Healthy cats have two kidneys, which provides some built – in redundancy: even when one kidney begins to fail, the other can compensate.
Key Fact: CKD is defined as abnormal kidney function or structure persisting for more than three months.
How Common Is CKD in Cats?
CKD is one of the top health concerns for older cats, and the numbers are striking. Studies estimate that CKD affects roughly 40% of cats older than the age of 10. In cats 15 years and older, some experts place that figure as high as 80%. Age remains the single known risk factor – meaning all senior cats are considered at risk, regardless of breed or lifestyle.
Given how widespread the disease is, understanding its signs, diagnosis and management is essential knowledge for anyone caring for a cat in their senior years.
What Are the Signs of CKD in Cats?
In the early stages of CKD, cats often show no obvious signs at all. As the disease progresses and the kidneys lose their ability to concentrate urine effectively, subtle changes begin to appear. Common signs include:
- Increased thirst and more frequent urination
- Weight loss and reduced appetite
- Lethargy and decreased energy
- Vomiting or nausea
- Unkempt coat
- Pale or white gums (a sign of anemia)
Cats with CKD are also at risk for hypertension (high blood pressure), which can cause sudden vision changes, disorientation, or heart complications. The kidneys also help produce red blood cells, so anemia becomes a risk as disease progresses.
Because many of these signs can be subtle, especially early on, regular veterinary wellness visits with bloodwork are the most reliable way to catch CKD before it becomes advanced.
How Is CKD Diagnosed?
Diagnosing CKD typically requires a combination of clinical signs, blood tests, and urinalysis. There is no single test that provides a complete picture, which is part of what makes early detection so challenging.
Blood tests measure waste products that healthy kidneys filter from the body – most notably blood urea nitrogen (BUN), creatinine, and symmetric dimethylarginine (SDMA). Elevated levels can signal impaired kidney function. A urinalysis examines urine concentration, the presence of protein, pH, and abnormal cells. Low urine concentration can be among the earliest indicators of CKD, though it must be interpreted carefully in context.
Additional diagnostics may include blood pressure measurement, abdominal ultrasound, and urine culture to rule out bacterial infection. Together, these tools allow veterinarians to assess both the presence and severity of kidney disease.
Key Fact: Current standard tests can only detect CKD after the majority of kidney function is already gone, which is why researchers are working hard to develop better early-detection tools.
What Do the Chronic Kidney Disease Stages Mean?
Veterinarians use a four-stage system developed by an international panel of kidney specialists.
Stages run from 1 (mild, often no clinical signs) through 4 (severe, with significant systemic illness). Treatment recommendations are tailored to each stage, and cats may move between stages over time, most commonly progressing to higher stages as kidney function declines, though some cats stabilize or even improve with treatment.
How Is CKD Treated?
There is no cure for CKD, but many cats can live comfortably for months or years with the right management. Treatment goals center on slowing disease progression, managing symptoms and maintaining quality of life.
Diet Modification: Dietary management is the cornerstone of CKD treatment. Specialized kidney diets are formulated to reduce the workload on the kidneys, typically by limiting phosphorus and adjusting protein levels. These diets have the strongest evidence base for slowing disease progression, particularly in cats at IRIS Stage 2 or 3 who are still eating well.
Fun Fact: The prescription kidney diet has deep roots in Morris Animal Foundation's origin story. In the 1930s, Foundation founder Dr. Mark L. Morris Sr. developed a homemade diet to treat dogs suffering from kidney disease in his New Jersey practice. When Morris Frank – a national ambassador for The Seeing Eye – brought his ailing guide dog, Buddy, to Dr. Morris, that diet helped Buddy recover. Encouraged by the results, Frank urged Dr. Morris to produce the formula on a larger scale. Dr. Morris partnered with the Hill Packing Company of Topeka, Kansas, to can the recipe, which eventually became Hill's Prescription Diet k/d, the world's first therapeutic pet food for kidney disease. Dr. Morris then dedicated royalties from every can sold to fund animal health research, laying the financial groundwork for what would become Morris Animal Foundation.
Hydration Support: Cats with CKD cannot reabsorb water effectively and are prone to rapid dehydration. Encouraging water intake – through wet food, water fountains, or in some cases subcutaneous fluids administered at home – is an important part of long-term care.
Managing Complications: Depending on the individual cat, treatment may also include medications to control blood pressure, address anemia, manage phosphorus levels in the blood, or control nausea and appetite changes. Regular monitoring allows veterinarians to adjust therapy as a cat's condition evolves.
Close collaboration between owners and their veterinarian is essential. No two cats with CKD are identical, and treatment plans often require ongoing adjustment.
RESEARCH SPOTLIGHT: How Morris Animal Foundation Is Fighting CKD in Cats
Morris Animal Foundation has focused on feline chronic kidney disease for more than 35 years. That investment spans some of the earliest studies on the role of diet in CKD management (work that changed the standard of care), through to today's cutting-edge investigations into better diagnostics and novel treatments. Here's a look at where Foundation-funded science is making a difference.
The Early Detection Problem
The biggest obstacle in CKD care is timing. By the time current diagnostic tests flag a problem, the damage is already substantial. Foundation-funded researchers are tackling this head-on with two distinct approaches.
- A urine test that catches kidney disease sooner
- In one study, researchers are evaluating a technique called tandem mass spectrometry (MS/MS) to analyze proteins in cat urine. In human medicine, this method has proven powerful for identifying kidney damage earlier than conventional tests – and for predicting how quickly CKD will progress and whether specific treatments are likely to work. A small pilot comparing urine samples from healthy cats and cats with CKD yielded encouraging results. The research team is now expanding the analysis to a larger group of cats, using samples collected in prior studies, and examining how MS/MS results correlate with kidney function measurements, disease progression rates, and current CKD medications. If successful, this test could give veterinarians a much earlier, more detailed window into what is happening inside a cat's kidneys – without drawing blood.
- One protein, big potential: Tracking CKD without a blood draw
- Another ongoing study is focused on a specific protein called angiotensinogen (AGT), which can be detected in urine. Measuring AGT levels may offer a new, noninvasive way to assess kidney health and track disease progression – adding another potential tool to the diagnostic toolkit that veterinarians desperately need.
Rethinking Antacids: Do Cats with CKD Really Need Them?
For years, it was assumed that cats with CKD had elevated stomach acid levels, which led to the widespread use of antacid medications as part of routine CKD management. That assumption has since been called into question – and a Foundation-funded study is examining whether one of the most commonly prescribed acid blockers, omeprazole, actually delivers clinical benefit.
In a carefully designed clinical trial, cats with moderate CKD are receiving either daily oral omeprazole or a placebo, with researchers tracking whether the drug meaningfully reduces gastrointestinal signs like nausea, vomiting, and loss of appetite. Anecdotal reports have suggested omeprazole may help, but rigorous evidence has been lacking. The results of this study have the potential to reshape prescribing practices and spare cats from medications that carry real side effects but may offer little benefit.
Expert Voices: What Research Tells Us About CKD
Dr. Jessica Quimby, an associate professor of small animal internal medicine at The Ohio State University and a Morris Animal Foundation-funded researcher, has devoted her career to understanding how kidneys age, why they fail, and whether better drugs can improve quality of life for affected cats.
In a conversation on the Foundation's Fresh Scoop podcast, Dr. Quimby discussed both what science has revealed about CKD and the significant gaps that remain. The causes of CKD in most cats are still not fully understood, which makes prevention difficult and treatment partly a matter of managing consequences rather than addressing root causes. That is precisely why ongoing research matters. Every study that illuminates the biology of kidney aging in cats brings the field closer to earlier detection, more targeted treatment and ultimately, better outcomes.
The Road Ahead
CKD touches more cat families than almost any other disease, and there is still so much we don't know. The causes remain unclear in most cats. Better early-detection tools are on the horizon but not yet in clinical use. And while diet and supportive care can slow the disease, nothing has yet been shown to stop or reverse it. That's exactly why research can't stop here.
Support the Research That Gives Cats a Fighting Chance
The research is promising. The need is urgent. And none of it happens without donors who believe cats deserve better.
Morris Animal Foundation has funded more than 3,200 animal health studies, including decades of work on feline CKD. Your gift keeps that work moving forward, toward earlier detection, better treatment, and one day, a way to stop this disease before it starts.
QUICK ANSWERS: Common Questions About CKD in Cats
- At what age should cats be screened for CKD?
- Veterinarians generally recommend annual bloodwork and urinalysis beginning around age 7, with more frequent monitoring for cats age 10 and older. Age is the primary known risk factor, so all senior cats benefit from regular kidney function screening.
- Can CKD be prevented?
- There is currently no proven way to prevent CKD in cats. The disease's causes in most individuals remain poorly understood. What owners can do is ensure their cats receive regular veterinary checkups so that if CKD develops, it is caught as early as possible – when intervention is most effective.
- How long can a cat live with CKD?
- Prognosis varies considerably depending on the stage at diagnosis, the individual cat's response to treatment, and whether other health conditions are present. Cats diagnosed at earlier stages and managed proactively can live comfortably for years. Cats diagnosed at advanced stages have a more guarded outlook.
- Is CKD painful for cats?
- CKD itself is not typically described as a painful condition, though the nausea, fatigue, and loss of appetite associated with advanced disease affect quality of life significantly. Managing these symptoms is a central goal of treatment.
- What's the most important thing I can do for my cat?
- Stay current on veterinary wellness visits, especially as your cat ages. Early detection remains the most powerful tool available – and routine bloodwork is how CKD is most often found before symptoms appear.
