Companion Cat Chronic Kidney Disease: Managing the Most Common Senior Cat Illness

Chronic kidney disease (CKD) affects the majority of elderly cats and is a leading cause of cat death, causing prolonged suffering without appropriate ongoing management.

Key Facts

CKD affects approximately 30-40% of cats over 15 years old and is the most common cause of death in elderly cats
Early CKD may be asymptomatic; by the time clinical signs appear, 75%+ of kidney function may already be lost
Symptoms include increased thirst and urination, weight loss, vomiting, lethargy, and poor coat quality
Diet modification — reduced phosphorus, appropriate protein — is the cornerstone of CKD management
Subcutaneous fluid therapy at home significantly improves quality of life in cats with CKD
Newer treatments including a gut microbiome supplement (Semintra, Benazepril) can slow disease progression

Welfare Considerations

CKD causes progressive, multi-system suffering in cats. Uraemia — the build-up of waste products — causes nausea, mouth ulcers, neurological changes, and profound malaise. Anaemia secondary to CKD reduces energy and causes weakness. Hypertension from CKD can cause sudden blindness. Without intervention, advanced CKD is characterised by profound suffering in the weeks before death. With good management — appropriate diet, fluid therapy, blood pressure control, and phosphate binders — many cats maintain good quality of life for months to years after diagnosis. Regular monitoring through blood and urine testing allows owners and veterinarians to track progression and adjust management.

What You Can Do

Request annual blood and urine screening for cats over 7 — early CKD detection enables earlier intervention
Learn subcutaneous fluid administration at home for CKD cats — it significantly improves quality of life
Feed a veterinary-prescribed renal diet if CKD is diagnosed — dietary phosphorus restriction is critical
Use validated quality-of-life assessment tools to guide end-of-life timing compassionately