Cat Chronic Kidney Disease (CKD): Early Signs, Why Cats Drink More, and Long-Term Care Basics
Increased thirst, weight loss, and quieter behaviour can signal kidney disease—early detection changes how long comfort can be maintained.
Chronic kidney disease in cats is a progressive loss of kidney function common in middle-aged and senior cats. The kidneys filter waste, balance fluids and electrolytes, and help control blood pressure. As function declines, cats often drink and urinate more, lose weight, become pickier with food, and seem less interested in grooming. CKD is not usually curable, but staged veterinary care—fluids strategy, diet, blood-pressure control, and treatment of nausea—can preserve quality of life for a meaningful period.
Key takeaways
- Drinking more and peeing more in an older cat is a reason for blood and urine tests—not a personality quirk.
- IRIS staging helps clinicians match treatment intensity to disease severity.
- Appetite support and hydration are daily priorities once CKD is diagnosed.
On this page
- Early signs owners notice
- How CKD is diagnosed and staged
- Treatment themes
- Home care that actually helps
- Monitoring and when to recheck
- FAQ
Early signs of CKD in cats
- Increased thirst and larger urine clumps in the litter box
- Gradual weight loss despite a seemingly normal appetite at first
- Vomiting, reduced appetite, or “picky” eating as disease advances
- Dull coat, less grooming, muscle loss along the back
- Lethargy or hiding more than usual
- Occasional bad breath with a uraemic odour in later stages
These signs overlap with hyperthyroidism, diabetes, and dental disease. Bloodwork and urinalysis are how clinicians separate the causes—not guesswork from one symptom alone.
Diagnosis and staging
Typical work-ups include chemistry panels (creatinine, urea/BUN, SDMA where used), urinalysis (concentration ability, protein, infection), and often blood pressure measurement. Imaging may be advised. IRIS staging uses creatinine (and related markers) plus urine protein and blood pressure to guide prognosis talk and treatment intensity. Your veterinarian interprets numbers in context of muscle mass and hydration—raw values without context mislead.
Treatment themes (individualised)
Plans commonly address hydration, nutrition, phosphate control, blood pressure, nausea, anaemia when present, and urinary tract infections. Prescription renal diets are a cornerstone for many cats when they will eat them. Forcing a diet the cat refuses helps no one; transition strategy and appetite support matter. Subcutaneous fluids are prescribed for some cats—training and sterile technique come from the clinic, not internet improvisation.
- Do not start human medications or random “kidney detox” supplements
- Do not restrict water—CKD cats need access to water
Home care that supports clinic plans
- Multiple water stations and wide bowls; many cats prefer running water
- Wet food where appropriate and accepted
- Quiet feeding locations; warm food slightly to increase aroma
- Easy litter box access on every floor the cat uses
- Weight checks at home on a kitchen scale weekly if advised
Hydration behaviour connects to our feline hydration guide. Senior patterns also appear in broader wellness care discussions.
Managing a CKD diagnosis?
Our Healthcare Consultations pathway helps you organise questions about appetite, fluids, and monitoring schedules for your veterinary team.
FAQ
Is CKD a death sentence?
No. Many cats live months to years with good quality of life when staged and managed appropriately. Outlook depends on stage, complications, and response to care.
Why is my cat still losing weight?
Muscle loss and inadequate calorie intake are common. Talk to your vet about appetite stimulants, anti-nausea therapy, diet trials, and feeding tubes in advanced cases when appropriate.
Can CKD be reversed?
Chronic structural loss is generally not reversed. The goal is slowing progression and protecting comfort.
Educational content only. This page does not diagnose disease or replace care from a licensed veterinarian. Seek in-person help for emergencies or worsening symptoms.