Chronic kidney failure in cats: stages, symptoms and diet

Chronic kidney disease (CKD) is the most common disease in older cats. It is estimated to affect approximately 30-40% of cats over 10 years old. Although there is no cure, with proper management many cats live for years with a good quality of life after diagnosis.

What is chronic kidney failure in cats?

The kidneys filter waste products from metabolism and regulate the body's water and mineral balance. In chronic kidney disease (CKD), the kidneys progressively and irreversibly lose this ability , leading to a buildup of toxins in the blood (uremia).

Cats are especially vulnerable to this disease because, by nature, they drink little water and their urine is highly concentrated, which puts continuous strain on their kidneys throughout their lives.

Symptoms of kidney failure in cats

One of the major problems with feline chronic kidney disease (CKD) is that symptoms don't appear until the kidneys have lost 70-75% of their function . That's why annual blood and urine tests are essential for older cats.

• Polydipsia and polyuria: drinks and urinates much more (the kidney stops concentrating the urine)
• Loss of weight and muscle mass progressive
• Loss of appetite and vomiting
• Lethargy and weakness
• Dull and dull coat
• Bad breath with an ammonia smell (uremia)
• Mouth ulcers
• Constipation
• High blood pressure (can cause sudden blindness)

Feline IRIS stages (classification)

The International Renal Interest Society (IRIS) classifies CKD into 4 stages according to creatinine and SDMA levels in the blood:

• Stadium I: Kidney disease present but kidneys still compensated. No symptoms.
• Stage II: Moderate deterioration. The first subtle symptoms may appear.
• Stage III: Moderate-to-severe renal insufficiency. Clear symptoms.
• Stage IV: Severe renal insufficiency. Significant uremia and a more guarded prognosis.

Discovery

The diagnosis is made by:

• Blood tests: creatinine, urea, SDMA (earliest marker), phosphorus, potassium
• Urine analysis: urine specific gravity, protein, sediment
• Blood pressure measurement
• Renal ultrasound: evaluates the size and structure of the kidneys

Nutrition: the most important tool

Diet is the cornerstone of feline chronic kidney disease (CKD) management. Specific renal diets are formulated to:

• Low phosphorus content (Phosphorus accelerates kidney deterioration)
• High-quality protein in controlled quantities (reduces the accumulation of toxins without causing malnutrition)
• High water content (wet food especially recommended)
• Potassium supplementation if hypokalemia is present
• Omega-3 fatty acids with a nephroprotective effect

In our store you can find special wet diets for cats and renal feeds specifically formulated for cats with CKD.

Home care

• Provide always fresh and accessible waterMany cats drink more if the water is moving (cat fountains).
• La wet food It provides more water and is usually more appealing to cats with a poor appetite.
• Subcutaneous fluid therapy at homeIn advanced stages, the veterinarian can teach you how to administer serum under the skin to maintain hydration.
• Veterinary check-ups every 3-6 months (complete analyses).
• Kidney support supplements Phosphate binders and omega-3 fatty acids can be prescribed as a supplement.

FAQ

How long can a cat with kidney failure live?

It depends on the stage at diagnosis and the response to treatment. Cats diagnosed in stages I-II can live for years. In advanced stages, the prognosis is more guarded, but palliative treatment can maintain a good quality of life.

Can chronic kidney disease (CKD) be prevented in cats?

Not completely, but permanent access to water, a wet diet (with good hydration) and annual analytical controls from the age of 7 can allow the disease to be detected before it causes symptoms.

Can my cat with CKD eat normal food?

It is not recommended. Conventional diets often contain too much phosphorus and protein for a damaged kidney. Specific kidney diets are designed to reduce the burden on the kidneys and slow the progression of the disease.

Conclusion

Chronic kidney disease in cats is a serious but manageable condition. Annual checkups starting at age 7 are the best way to detect it early. With the right diet, adequate hydration, and veterinary follow-up, your cat can maintain a good quality of life for years.