Chronic kidney disease in senior cats: the quiet condition

If you live with an older cat, her kidneys deserve some attention. Chronic kidney disease (CKD) is one of the most common conditions in senior cats — and it usually starts quietly.

The catch: cats compensate for failing kidneys for a long time. Clear symptoms often appear only once a large part of kidney function is already lost. If you only react to visible signs, you're often late — unless you start looking deliberately, earlier.

What the kidneys do — and what happens when they slow down

The kidneys filter waste products (urea, creatinine, phosphate) from the blood, balance water and salts, keep blood pressure steady and produce a hormone (erythropoietin) that prompts red-blood-cell formation. When filtering slows, waste builds up — which can cause nausea and loss of appetite and, over time, strain the whole body.

The International Renal Interest Society (IRIS) groups CKD into four stages based on blood values such as creatinine and SDMA. Stage 1 often causes no symptoms yet and is typically picked up on bloodwork at a senior check. Stage 4 is end-stage.

Early cues that are easy to miss

These changes are often the first thing owners notice — and they're often only mentioned to the vet weeks later.

• Drinking more and urinating more — litter clumps get bigger or more frequent
• Slow weight loss even though she seems to eat normally
• A duller, less groomed coat
• Periods of reduced appetite, particularly for dry food
• Occasional vomiting, often in the morning on an empty stomach
• New drinking habits — from the shower, from glasses, from the tap

Why regular blood tests matter as cats age

The most reliable way to catch CKD early is blood and urine testing before symptoms appear. Many vets recommend a regular senior panel for older cats: creatinine, SDMA, urea, phosphate, electrolytes and a urinalysis (for example urine specific gravity and protein-to-creatinine ratio). Ask your vet from what age and how often that makes sense for your cat.

When CKD is caught at an early stage, many cats have a long stretch of good quality of life ahead with the right support.

What your vet may recommend

Kidney diet

Prescription kidney diets are among the best-studied measures in CKD. They contain less phosphate and adjusted protein, aiming to ease the kidneys' workload. The switch often takes patience — many cats accept new food only slowly. Ask your vet which diet fits.

Phosphate binders

If phosphate stays high despite the diet, your vet may prescribe phosphate binders mixed into food.

Blood pressure and protein in the urine

Many cats with CKD develop high blood pressure (which can damage the eyes, among other things) or lose protein in their urine. There are medicines for both, which your vet chooses and doses based on the findings.

Fluids

In later stages, giving fluids under the skin can help. Many owners learn this at the clinic — it sounds daunting, but for many it becomes a calm little routine.

What you can do at home

1. Water everywhere: several drinking spots, perhaps a fountain, fresh water several times a day. Cats are fussy.
2. Think about wet food: it adds extra fluid — ask your vet how it fits the feeding plan.
3. Reduce stress: quiet retreats, no competition over bowls and litter boxes in multi-cat homes.
4. Litter hygiene: enough boxes, cleaned often — a cat who avoids her box often drinks less too.
5. Weigh regularly: note her weight, for example weekly. A steady loss is worth discussing.

Quality of life over time

CKD is chronic and can't be cured — but that doesn't mean your time together has to be short. What changes: regular check-ups at the rhythm your vet suggests, daily attention to drinking and eating, and occasional adjustments to treatment.

A simple log helps: appetite, activity, vomiting, water intake, weight. In Senicure you record this in the daily check-in and journal — and take the trend to your vet as a report. Our breed guides also list what to keep an eye on for your cat.

Red flags

With these signs, call your vet today — don't wait for the next routine appointment. With breathing trouble or collapse, go to an emergency clinic straight away.

• She hasn't eaten anything for 24 hours
• Repeated vomiting, especially with blood
• Sudden listlessness, hiding, no response to favourite things
• Fast, shallow or laboured breathing, pale gums
• Sudden blindness or unusually wide pupils

In summary

CKD is common in older cats. With regular check-ups it's caught earlier — and with diet, attentive observation and a good relationship with your vet, you can gain a lot of good time together. Watch the water and the litter box, weigh regularly, and take quiet changes seriously before they get loud.