Kidney disease is one of the most common health conditions affecting senior cats, especially those over the age of seven. While it is progressive and worsens over time, many cat owners actually see significant improvement with proper veterinary treatment and management.

What is Feline Kidney Disease?

Your cat’s two kidneys are a vital part of her organ system. They primarily work to filter out waste and excess minerals like potassium from her bloodstream, but they’re also integral to ensuring she stays well-hydrated. When we talk about kidney disease—also called renal disease or renal failure—we’re describing a condition in which your cat’s kidneys aren’t performing as they should.

Here’s something important many cat owners don’t realize: kidneys are remarkably resilient organs. In most cases, the kidneys’ function must decrease by over half before a cat begins to show symptoms. Because this deterioration happens gradually over weeks or months rather than overnight, cats diagnosed for the first time are usually classified as having Chronic Kidney Disease (CKD) or Chronic Renal Failure (CRF).

This is different from acute kidney failure, which develops suddenly and is always considered a medical emergency. Acute renal failure in cats can occur within hours or days and may be caused by:

• Toxin exposure or poisoning
• Trauma
• Urinary blockages
• Severe dehydration
• Infection or heart failure

What Causes Chronic Kidney Failure in Cats?

Well, a lot of things. Most cats with chronic renal failure are also battling other health conditions. Your cat’s body naturally prioritizes vital functions like breathing and heart health over kidney performance, which can accelerate kidney decline when other systems are stressed.

Common causes of kidney disease in cats include:

• Chronic kidney stones that damage kidney tissue over time
• Bacterial infections like Pyelonephritis or viral infections such as FeLV (Feline Leukemia Virus) or FIP (Feline Infectious Peritonitis)
• Amyloidosis, a condition involving abnormal protein accumulation
• Neoplasia (kidney tumors or cancer)
• Glomerulonephritis, inflammation affecting the kidney’s filtration membranes
• Congenital kidney malformation present from birth

4 Warning Signs of Kidney Disease in Cats

Because chronic renal disease comes on so slowly, it can often be difficult to tell if there’s something wrong with your cat until the disease is quite advanced. You’re your cat’s best advocate; if something seems off, especially if your cat is older than 7, contact your vet. A simple blood test could save your cat’s life.

Watch for these telltale signs of kidney disease in cats:

1. Changes in Urination and Thirst

Is your cat urinating more frequently than normal? Has she suddenly stopped using her litter box consistently? Increased urination (polyuria) paired with excessive thirst (polydipsia) are classic symptoms of feline kidney disease. Your cat drinks more water because her compromised kidneys are flushing out too much fluid.

2. Weight Loss and Appetite Changes

Unexplained weight loss is particularly concerning when accompanied by decreased appetite, a dull or unkempt coat, vomiting, or diarrhea. Cats with kidney disease often lose interest in food as toxins accumulate in their systems.

3. Recurring Urinary Tract Infections

As kidneys fail, they produce increasingly diluted urine that’s less effective at fighting bacterial and viral infections. If your cat experiences chronic UTIs, kidney disease could be the underlying cause.

4. Bad Breath and Mouth Problems

Severe bad breath in cats (often described as ammonia-like or “uremic breath”) should always prompt evaluation for kidney disease. Additionally, watch for mouth ulcers, gum inflammation, or tongue sores—all potential indicators of advanced renal failure.

Diagnostic Testing for Kidney Disease in Cats

The recommended treatment plan for feline kidney disease depends heavily on the stage and severity of your cat’s condition. Until relatively recently, CKD in cats was actually pretty difficult to test for.

To determine disease severity, veterinarians use the IRIS (International Renal Interest Society) staging system. This involves several diagnostic tests:

Treatment Options for Cats with Kidney Disease

While kidney tissue cannot be “regrown,” the symptoms can be managed to keep your cat comfortable for years.

Diet Modification for Kidney Disease Management

Switching to a kidney-friendly diet is often the first and most effective treatment step. Prescription kidney diets are formulated to be low in protein and phosphorus, reducing the burden on your cat’s compromised kidneys. Always consult your veterinarian about the specific renal diet they recommend for your cat’s individual needs.

Medication and Supplements

Depending on your cat’s specific needs, your vet may prescribe:

• Phosphate binders to manage mineral levels
• Antibiotics for concurrent infections
• Blood pressure medication (hypertension is common in CKD cats)
• Antiemetics to stop nausea and encourage eating.
• Subcutaneous fluids to provide extra hydration at home
• Supplements for anemia, vitamin deficiencies, or low potassium.

Figuring out which medication is most effective can take some trial and error.

Long-Term Management and Prognosis

With consistent monitoring, regular veterinary check-ups, and a comprehensive treatment approach combining diet and medication, many cats with chronic kidney disease can maintain a good quality of life for months or even years. Early detection is crucial—the sooner kidney disease is diagnosed and treatment begins, the better your cat’s prognosis and the more quality time you’ll have together.

Suspect Your Cat Might Have Kidney Disease?

If your cat is showing signs of kidney disease—or even if you just have a hunch something’s not right—talk to your veterinarian. Catching CKD early can make all the difference in giving your cat a better, more comfortable life. 

If you’re curious about the future of care, Gallant is currently studying an investigational donor-derived, ready-to-use stem cell therapy designed to be consistent, scalable, and practical for real-world clinical use. In feline chronic kidney disease, Gallant’s research focuses on how these cells may support the body’s natural regulatory and anti-inflammatory processes, rather than replacing damaged tissue or serving as a cure. 

You can learn more about our clinical trial for feline chronic kidney disease and see if your cat may be eligible to participate.