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

Chronic kidney disease (CKD) is the leading cause of death in senior cats. Early detection, dietary management, and supportive care significantly extend comfortable life expectancy for affected cats.

Key Facts

CKD affects approximately 30-40% of cats over 10 years and 80% of cats over 15 years
The kidneys of affected cats progressively lose nephrons — functional filtration units — which cannot regenerate
Early CKD is often clinically silent; routine bloodwork and urinalysis are essential for detection before signs develop
IRIS staging (1-4) classifies CKD severity and guides treatment decisions based on creatinine and SDMA measurements
Phosphorus restriction through prescription renal diets significantly slows CKD progression when started early
Dehydration worsens kidney function — encouraging water intake through fountains, wet food, and subcutaneous fluids is critical
Blood pressure hypertension is common in CKD cats and causes secondary organ damage including blindness if untreated

Welfare Considerations

Feline CKD is a chronic progressive condition that significantly affects quality of life through nausea, reduced appetite, weight loss, and lethargy as it advances. The welfare priority is detecting CKD before it causes clinical signs — when dietary intervention and supportive care are most effective at slowing progression. A cat with well-managed early CKD can live comfortably for years; a cat in late-stage CKD experiences significant suffering from uraemic toxin accumulation. Welfare-positive CKD management includes regular monitoring with SDMA and creatinine screening, phosphorus restriction through renal diet adoption before the cat is symptomatic, aggressive hydration support, and blood pressure management. Quality of life assessment informs decisions about when supportive care is no longer maintaining adequate welfare.

What You Can Do

Screen all cats over 7 years annually with bloodwork and urinalysis including SDMA to detect CKD before clinical signs
Transition CKD-diagnosed cats to a phosphorus-restricted renal prescription diet as soon as diagnosed, even at early stages
Encourage water intake through wet food, water fountains, and multiple water stations throughout the home
Ask your veterinarian about blood pressure monitoring and treatment for hypertension in any cat with CKD
Use validated quality of life scales regularly and discuss findings with your veterinarian to guide treatment decisions