Cat Chronic Kidney Disease: Management and Welfare

Chronic kidney disease is one of the most common conditions in older cats, and careful management through diet, hydration and veterinary care can significantly improve quality of life.

Key Facts

Chronic kidney disease (CKD) affects approximately 30–40% of cats over 10 years of age
CKD is staged 1–4 using the International Renal Interest Society (IRIS) guidelines based on creatinine, SDMA and urine specific gravity
Symptoms include increased thirst and urination, weight loss, vomiting, decreased appetite and lethargy
Symmetric dimethylarginine (SDMA) is an early biomarker that can detect CKD up to 17 months before creatinine rises
Phosphorus restriction is one of the most evidence-supported interventions to slow disease progression
Subcutaneous fluid therapy administered at home is widely used to manage dehydration in moderate-to-severe CKD
Hypertension affects approximately 65% of CKD cats and requires treatment to prevent strokes and retinal damage
Median survival after CKD diagnosis is approximately 1–3 years depending on stage at diagnosis and management quality

Welfare Considerations

CKD is a slow, progressive disease that significantly impacts cat welfare. Nausea and reduced appetite cause persistent discomfort; uraemic toxins create a chronic "malaise" that owners often describe as their cat seeming "not quite themselves." Pain from hypertension-related complications, including retinal detachment and sudden blindness, causes acute distress. Many cats dislike subcutaneous fluids, and the daily or twice-weekly restraint required can be stressful. Conversely, well-managed CKD cats often maintain good quality of life for years — the welfare impact of treatment depends heavily on individual tolerance and owner technique. Anti-nausea medications (maropitant), appetite stimulants (mirtazapine transdermal) and phosphate binders have transformed comfort outcomes. End-of-life decisions are challenging: owners often err on either prolonging life too long or euthanasing prematurely, both of which have welfare costs.

What You Can Do

Schedule biannual wellness bloodwork for cats over 7 years to enable early CKD detection
If your cat is diagnosed, request IRIS staging to guide appropriate management
Learn subcutaneous fluid administration — YouTube tutorials and veterinary nurses can teach the technique
Feed a phosphorus-restricted veterinary renal diet from diagnosis; avoid high-phosphorus foods
Monitor blood pressure regularly — hypertension is silent but causes severe complications
Use validated Quality of Life scales (such as the HHHHHMM scale) to guide end-of-life decisions
Contact the International Cat Care charity for evidence-based owner guidance on CKD management