Kidney disease in cats
PetPort EditorialLast reviewed
What are the early signs of kidney disease in cats?
Drinking noticeably more and urinating more are the first signs, and they appear long before a cat looks ill. Weight loss over the spine, a duller coat and gradual appetite loss follow. Chronic kidney disease is one of the commonest illnesses in cats over seven, and early detection genuinely changes how long they live.
General guidance for pet parents, not a diagnosis. Every animal is different — confirm anything that concerns you with your veterinarian.
Quick reference
| Commonest in | Cats over seven |
|---|---|
| First sign | Increased thirst and urination |
| Screening from | Age seven — annual blood and urine test |
| Not reversible | But manageable for years when caught early |
| Diet matters | A prescription renal diet is the single best-evidenced intervention |
| Watch litter | Larger clumps mean more urine, an early and easy signal |
What is happening
Chronic kidney disease develops slowly as functioning kidney tissue is lost. Cats compensate for a long time, so by the time an owner notices, a substantial share of function has usually gone. It cannot be reversed, but it can be managed for years.
Signs to watch for
- Drinking much more, and larger or more frequent wet patches in the litter
- Gradual weight loss you can feel over the spine and hips
- A duller, unkempt coat and slowly declining appetite
What you can do
- Measure and note how much water goes into the bowl each day
- Ask for a blood and urine test annually from age seven
- Keep multiple water sources around the house — a fountain often increases intake
See a vet if
Your cat is drinking more than usual, losing weight, vomiting intermittently, or is over seven and has never had kidney values checked.
In India specifically
Heat raises the stakes: a cat with reduced kidney function dehydrates faster through an Indian summer, so water access matters more here than in temperate climates. Prescription renal diets are available in most Indian metros but supply can be inconsistent in smaller cities — ask your vet about ordering ahead so you are not forced to switch diets abruptly.
Common questions
How much water is too much for a cat?
Rather than a fixed figure, watch for change. A cat that has started emptying the bowl, seeking taps, or leaving noticeably larger litter clumps has changed, and that change is the signal. Measure the bowl for a few days and bring the number to your vet.
Can cat kidney disease be cured?
Chronic kidney disease cannot be reversed, because lost kidney tissue does not regenerate. It can be slowed and managed, often for years, with diet, blood pressure control and hydration support. Acute kidney injury, which is different, can sometimes be recovered from if treated fast.
What food is best for a cat with kidney disease?
A veterinary prescription renal diet has the strongest evidence of any single intervention — it is phosphorus-restricted and protein-adjusted. Home-cooked substitutes rarely match it. If your cat refuses the diet, tell your vet rather than giving up; there are several formats and brands.
At what age should I start testing my cat's kidneys?
From seven, annually. Earlier if your cat is a breed with known kidney risk, has had a urinary blockage, or has ever been on medication affecting the kidneys. A routine blood and urine panel is inexpensive relative to what early detection buys.