Health Kidney Disease

Chronic Kidney Disease in Cats

Early signs, diagnosis and management tips for one of the most common feline health conditions.

Dr. Marcus Vance

Veterinary Clinical Pathologist, DACVP

Apr 20, 2025 5 min read

Clinically Reviewed

Medically evaluated & fact-checked by Dr. Elena Rostova, DVM.

Understanding Feline Chronic Kidney Disease (CKD)

Chronic Kidney Disease (CKD) is characterized by the irreversible, progressive loss of functional renal nephrons over months or years. It affects over 30% of cats over 10 years of age and remains one of the top causes of mortality in senior felines.

Early Warning Indicators

Because the healthy portions of the kidneys compensate until roughly 67-75% of function is lost, early symptoms are subtle:

Polydipsia and Polyuria (PUPD): Noticeably drinking more water and producing larger, heavy litter clumps.
Progressive Weight Loss: Loss of muscle mass along the spine despite normal appetite initially.
Poor Coat Quality: Dry, unkempt coat due to subclinical dehydration.

The 4 IRIS Stages of Kidney Disease

The International Renal Interest Society (IRIS) classifies CKD into four distinct stages based on stable blood creatinine, SDMA, blood pressure, and urine protein-to-creatinine ratio (UPC). Early staging allows tailored therapeutic diets with controlled phosphorus and therapeutic hydration.

Key Takeaways

Feline body temperature over 103.5°F requires prompt veterinary clinical assessment.
Never administer human antipyretics or analgesics; drugs like acetaminophen are lethal to felines.
Laboratory tests like CBC, serum biochemistry, and SAA guide accurate targeted treatment.
Subtle behavioral changes like lethargy, appetite loss, and hiding are frontline indicators of distress.

Written By

Dr. Marcus Vance

Veterinary Clinical Pathologist, DACVP

Specialized in feline internal medicine and dedicated to translating complex veterinary clinical diagnostics into actionable health insights for devoted cat guardians.