My Cat Has Kidney Disease: How to Support Her at Home (2026 Vet Guidelines)
27 September 2026 ยท Educational only. This article summarises published veterinary guidance and does not replace your vet's advice. Always follow the treatment plan your vet gives you.
Short answer: the things that most help a cat with chronic kidney disease (CKD) at home are a veterinary kidney (renal) diet, extra water in their day, regular monitoring with your vet, and treating complications such as nausea, high blood pressure and low potassium when they appear. A prescription renal diet is the single best-evidenced step: cats with CKD eating one live two to three times longer, on average, than cats on standard food (Cornell Feline Health Center).
If your cat has just been diagnosed
- CKD is very common in older cats: up to 40% of cats over 10 and 80% over 15 are affected (Cornell).
- Many cats live well for years after diagnosis, especially when it is caught early.
- No supplement treats kidney disease. Check every supplement, treat and diet change with your vet before starting it.
In this guide
- What is chronic kidney disease in cats?
- What should I feed a cat with kidney disease?
- How can I get more water into my cat?
- What medications and treatments might my vet recommend?
- How often should my cat with CKD see the vet?
- When should I call the vet straight away?
- Can supplements help a cat with kidney disease?
- Looking after an older cat with CKD day to day
- Frequently asked questions
What is chronic kidney disease in cats?
The kidneys filter waste from the blood, balance water and minerals, and help control blood pressure. In CKD, kidney function is gradually lost over months to years. It can't be reversed, but its progression can often be slowed and its effects managed.
Vets usually stage CKD using the IRIS system, from stage 1 (mild) to stage 4 (advanced), based on blood tests (creatinine and SDMA) and further classified by protein in the urine and blood pressure. Your cat's stage guides which of the steps below your vet recommends.
What should I feed a cat with kidney disease?
A veterinary therapeutic renal diet, unless your vet advises otherwise. The 2026 International Cat Care consensus guidelines state that feeding a renal diet "can prolong survival and reduce the risk of uraemic crises" (iCatCare, 2026). These diets are restricted in phosphorus (about 80 to 130 mg per 100 kcal, compared with 400 to 600 mg in standard diets) and moderated in protein and sodium.
Tips for switching:
- Change over gradually, across two to three weeks.
- Don't switch while she is nauseous or off her food; ask your vet to treat the nausea first, or she may develop an aversion to the new diet.
- Warm wet food slightly to boost its smell.
- If she refuses every renal diet, talk to your vet. Eating something matters more than eating the perfect diet.
How can I get more water into my cat?
- Feed wet food rather than dry (or add water to it).
- Put several water bowls around the home, away from her food.
- Try a water fountain; many cats prefer moving water.
- Use wide, shallow bowls.
- Your vet may teach you to give subcutaneous fluids at home, often every one to three days in later stages (Cornell).
What medications and treatments might my vet recommend?
| Problem | What your vet may use |
|---|---|
| High phosphate | Renal diet first; phosphate binders added to meals if needed after 4 to 6 weeks |
| Low potassium (muscle weakness, constipation) | Potassium supplements |
| High blood pressure | Blood-pressure medication, with regular checks |
| Nausea, vomiting, poor appetite | Anti-nausea medication and appetite stimulants |
| Protein in the urine | Medication to reduce protein loss |
| Anaemia (later stages) | Treatment to support red blood cell production |
Omega-3 fatty acids (EPA) are included in many renal diets, and the guidelines note improved survival in cats fed renal diets supplemented with EPA. Ask your vet before adding a separate fish oil, as the diet may already provide it.
How often should my cat with CKD see the vet?
Your vet will set a schedule based on her stage. Stable cats are often rechecked every 3 to 6 months; newly diagnosed or unstable cats more often. Checks usually include weight, blood pressure, blood tests and a urine test.
At home, keep a simple log: weight every week (kitchen or baby scales), appetite, water drinking, vomiting and energy. Small changes are easier to spot on paper.
When should I call the vet straight away?
- She stops eating for more than a day
- Repeated vomiting
- Sudden weakness, wobbliness or collapse
- Sudden blindness (a sign of very high blood pressure)
- Very little or no urine
Can supplements help a cat with kidney disease?
No supplement treats kidney disease, and some products marketed for pets add phosphorus, protein or other ingredients a cat with CKD may need to limit. The safe rule is simple: show your vet the label of every supplement and treat before you give it, including anything she was taking before her diagnosis.
Looking after an older cat with CKD day to day
Cats with CKD are usually older cats with other age-related needs too: stiff joints, less muscle and lower energy. Warm bedding, steps up to favourite spots, a low-sided litter tray and gentle daily play all help. Our senior cat care guide covers these in detail. For early warning signs, see old cat getting skinny but still eating.
Frequently asked questions
How long can a cat live with kidney disease?
It varies widely with the stage at diagnosis. Cats diagnosed early and managed with a renal diet often live for years. Your vet can give a better estimate based on her IRIS stage and response to treatment.
Is kidney disease painful for cats?
CKD itself isn't usually described as painful, but its effects (nausea, dehydration, mouth ulcers in later stages) make cats feel unwell. Treating nausea and dehydration makes a big difference to comfort.
Can I give my cat with kidney disease treats?
Many treats are high in phosphorus. Ask your vet about kidney-friendly options, or use small pieces of her renal diet as treats.
Should my cat with CKD drink a lot of water?
Cats with CKD often drink more because their kidneys can't concentrate urine. Never restrict water. Make water easy to find and encourage drinking.
Can kidney disease in cats be reversed?
Chronic kidney disease can't be reversed, but progression can often be slowed and complications managed. A sudden (acute) kidney injury is different and may be partly reversible, which is why prompt vet care matters.
Sources
- Taylor et al. (2026). iCatCare consensus guidelines on the diagnosis and management of chronic kidney disease in cats. Journal of Feline Medicine and Surgery
- Cornell Feline Health Center: chronic kidney disease
- ISFM consensus guidelines on feline CKD (2016)
This product is not intended to diagnose, treat, cure, or prevent any disease.
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