WagWatch
Cats with chronic kidney disease: home tracking
Care for cats with chronic kidney disease depends on the stage: earlier stages usually mean a diet change and regular blood and urine tests, and later stages can add fluids, help with appetite and nausea, and blood pressure or phosphorus control, each your vet’s call. What happens at home between visits matters just as much, so this guide covers what each stage means, what to ask your vet, what to write down, and when to call before the next appointment.
First: when to call now
- Straining in the litter box with little or no urine: your vet or an emergency clinic, now. Cornell calls a blocked urethra “a true medical emergency”.
- Not drinking, or vomiting again and again: your vet, now. IRIS warns that with kidney disease this can bring severe dehydration, which can be life-threatening.
- Sudden blindness, a seizure, a wobbly walk or new confusion: your vet, now. High blood pressure, common with kidney disease, can cause them (Cornell, IRIS).
- She may have eaten any part of a lily, or antifreeze: your vet, now (Merck).
- She stops eating: your vet, the same day.
And call about anything your vet asked you to watch for. A home log is never a reason to wait for the next visit.
Key takeaways
- Vets stage chronic kidney disease from 1 to 4 with the IRIS system and plan care around the stage; ask what your cat’s stage means for her.
- Kidney disease can bring nausea and a poor appetite. A cat who stops eating needs a call to your vet the same day.
- Log eating, drinking, the litter box and weight between visits; the changes are gradual, and a record catches what one visit cannot.
- How long a cat lives with it cannot be predicted with certainty, IRIS says; your vet follows her blood tests over time.
- Straining with little or no urine is an emergency; not drinking or repeated vomiting, a call now; not eating, a call the same day.
How do you tell acute kidney disease apart from chronic kidney disease in cats?
You don’t, at home; your vet does, and the Merck Veterinary Manual says knowing which it is, and the cause, guides what your vet does next. An acute kidney injury is sudden, major damage, often from something toxic such as antifreeze, a poisonous plant or certain medications; Merck calls severe injuries life-threatening, and says function can return if the cat survives. Chronic kidney disease (CKD) builds slowly, often for months or years before any sign, mostly in older cats, and Cornell’s Feline Health Center calls it progressive: care aims to slow it and keep her quality of life.
| Acute kidney injury | Chronic kidney disease | |
|---|---|---|
| Onset | Sudden | Months to years |
| Common causes | Toxins such as antifreeze or lilies, some medications, infection, a blocked blood supply | Gradual loss of kidney function, mostly with age |
| Can the damage recover? | Function can return if the cat survives the episode | No; care aims to slow it |
| What you see | Appetite loss, vomiting, dehydration, less urine | Small changes: drinking, urine, appetite, weight |
Sudden signs like those in the first column are a call to your vet now. CKD means steady observation between appointments, and the stage shapes what your vet recommends.
That record is where shared care helps: if a partner or sitter logs a skipped meal, the pattern is visible before the next appointment.
What does care for chronic kidney disease in cats actually involve at each stage?
Vets stage CKD with the IRIS staging guidelines, from 1 to 4, based on fasting blood creatinine, the blood test SDMA, or preferably both, measured at least twice while the cat is well hydrated and stable, then substaged by protein in the urine and blood pressure. Cornell explains why: in a dehydrated or sick cat the numbers can suggest a higher stage than she is in. IRIS says the stage is revised as things change. Care builds stage by stage, and every step below is your vet’s call.
Stage 1 and 2: diet and monitoring
Many cats show few or no signs in these stages; Merck says some urinate more. Cornell calls a diet change a proven part of managing CKD and usually the first one recommended, and says studies suggest kidney diets may prolong life and improve its quality; IRIS says diet changes work best in Stage 2 or early Stage 3, while appetite is good. Ask whether a kidney diet is right for her now, which one, how to switch, and whether any other food still fits. Merck puts checkups at every 3 to 6 months in Stages 2 and 3, with blood and urine tests. Log every meal: gradual changes are easy to miss when two people each see half the picture.
Stage 3: fluids, binders, and appetite management
By Stage 3, Merck says, signs appear, such as excessive thirst and urination, and checkups move to every 1 to 3 months in the later stages. Your vet may raise fluids under the skin, which Merck says they may teach you to give at home; a phosphate binder mixed into food when diet alone does not keep phosphorus down, which IRIS says belongs under a vet’s supervision; and medication for appetite or nausea. Each comes with your vet’s own instructions. Your part is the record: who gave fluids and when, every dose, every meal, as in what to write down before a vet appointment.
Stage 4: comfort and quality of life decisions
By Stage 4, Merck says, a cat feels and acts very sick: vomiting, depression, loss of appetite, weight loss, dehydration, mouth sores, diarrhea. Care focuses on easing those signs and on comfort, and when supportive care no longer helps, Merck says, euthanasia may have to be considered. Have that conversation with your vet honestly and early; your log gives it facts.
Why is my cat with kidney disease not eating, and what should I do about it?
Why kidney disease kills appetite
As kidney function falls, waste products build up in the blood. Cornell says this can make cats feel ill, look lethargic and unkempt, and lose weight; IRIS says the build-up likely suppresses appetite, and nausea and vomiting may be seen too. Cornell adds that cats with CKD who go without food for relatively short periods may develop significant health problems.
What to do at home and when to call the vet
Call your vet the same day she stops eating, and now if she is not drinking or keeps vomiting: Cornell says not eating can have a severe impact on a mature cat’s health if it goes on for as little as 24 hours. Don’t try new foods or tricks first; a diet change or appetite medication is your vet’s decision. Record what she ate, when, and what she refused, in a log your partner or sitter can add to. Our guide to tracking a cat with kidney disease at home shows how.
What daily signs should I track at home between vet visits?
Four things: eating, drinking, litter box output and weight, recorded the same way every day so small changes stand out. IRIS says the first clue is often a cat drinking more and producing more urine. Our kidney tracking guide has the method for each, and a weekly log to print.
Eating and drinking: what counts as a change
Note whether she finished the bowl, picked at it or skipped it. For water, the guide measures one day a week, because a bowl is a poor witness.
Litter box: urine volume and accidents
IRIS says more wet clumps in the litter box is one of the easier signs to notice in a cat. Count and size them when you scoop, and log accidents outside the box. Never take water away to cut down accidents: IRIS says that only risks dehydration.
Weight and body condition
Weigh her on the same scale at the same time of day, and write the number down with the date. If your vet gives you a body condition target, note where she sits against it.
Keeping the whole household on the same log
Here is where most logs fall apart: the partner writes on paper, the sitter texts, and by the appointment you are rebuilding the pattern from memory. One shared log, kept in seconds by whoever fed or scooped, answers “how has she been?” with dates and counts. In WagWatch, free on every plan:
- Meals take All, Some or None; a cat’s Medical list has Vomiting, Loss of appetite and Excessive thirst; her Potty entry starts on Litter box. There is no water counter, so the water number goes in a note.
- Fluids and medications are recorded with a dose and how often, with push reminders on the iPhone and Android apps.
- Everyone in your household logs into the same record, and every entry shows who logged it.
The honest caveat: no log replaces your vet, and WagWatch does not say what any of it means.
How long can a cat live with chronic kidney disease, and what affects life expectancy?
Ask your vet, and expect an honest “it depends”. IRIS says how long a cat with CKD will live is impossible to predict with certainty, because the rate it progresses varies considerably between animals. Cornell says the outlook depends on the stage when it is found and on how she responds to care, with evidence that finding and managing it earlier gives a better outcome; IRIS says some cats live several years with conscientious management by the vet and the caregiver.
Your vet reads the trend: IRIS says they follow creatinine and SDMA over months to see how fast it is moving and whether care is slowing it. The parts you control are medications given as planned, meals and water recorded, and small changes reported. In a shared-care household, keep each caregiver’s day in one place, as for a sitter.
What questions should I ask my vet when my cat is found to have CKD?
Bring your home log: eating, drinking, litter box output and weight, plus notes from other caregivers. A few weeks of recorded pattern answers more questions than memory does, and it shows your vet the weeks at home, not only one blood draw.
Questions about staging and care
- What IRIS stage is she in, and what does that mean for her today, not in general?
- Was she staged while well hydrated and stable, and will the stage be confirmed with a second test?
- What were her creatinine and SDMA results, her urine protein and her blood pressure?
- What do you recommend now, and what might wait until the next recheck?
- If you suggest a kidney diet, why does it help her, how should I switch, and what if she refuses it?
- Are fluids under the skin something we should think about yet?
Questions about monitoring between visits
- Which signs should make me call before the next appointment, and which mean an emergency clinic?
- How often should she have rechecks at this stage, with which tests?
- What should I record at home, and in what form?
When do home-managed symptoms mean it’s time to call the vet sooner?
Your log does not decide when to call; it makes the call more useful. The box at the top has the calls to make now. Beyond those, IRIS tells caregivers that if they are concerned about changes in thirst, urination, appetite, weight or behavior, early advice from the vet is always the best next step, and Merck says cats with kidney disease should see the vet more often when there are problems. So call before the scheduled visit when the record shows a change in:
- Eating: a refused meal, or a slide from full portions to picking.
- Drinking: drinking more, or drinking less, or not at all.
- Litter box: more or bigger clumps, fewer clumps, or accidents; straining with little or nothing produced is the emergency at the top of this page.
- Weight and behavior: a lower number on the scale, restless nights, or hiding that is new for her.
You do not have to judge the pattern yourself: several small changes together are a call even when each looks small, and the history turns that call into a conversation.
Questions
Can chronic kidney disease in cats be reversed?
No. Merck says there is rarely anything a vet can do about damage already done, and Cornell calls CKD progressive, so care aims to slow it and keep her quality of life. An acute kidney injury differs: Merck says function can return if the cat survives.
What are the signs my cat is dying of kidney failure?
Merck lists Stage 4’s signs as vomiting, depression, loss of appetite, weight loss, dehydration, mouth sores and diarrhea, and says that when supportive care no longer helps, euthanasia may have to be considered. Straining with little or no urine is an emergency now. Bring your log to your vet and talk honestly about her comfort.
How much water should a cat with kidney disease drink?
That is your vet’s to say, for your cat. What you can bring is the trend: IRIS says cats with CKD produce more urine and drink more to keep up, and that water should never be restricted. Measure the bowl the same way each week, and call your vet about a change, or now if she stops drinking.
Are subcutaneous fluids painful for cats?
Ask your vet, who will show you how they want it done if fluids are part of her care. IRIS says giving fluids at home needs an owner who is not squeamish about needles and a cat who will accept it with minimal restraint. If your cat fights every session, tell your vet rather than pushing through.
Should I switch my cat to a kidney diet?
Ask your vet; it is their call. Cornell calls a diet change a proven part of managing CKD and usually the first one recommended, and IRIS says it works best in Stage 2 or early Stage 3, while appetite is good. Ask why it helps her, how to switch, and what if she refuses it.
Sources
Every general statement about kidney disease, staging, appetite and emergencies on this page comes from one of these veterinary sources. WagWatch is not connected to any of them.
- Chronic Kidney Disease, Cornell Feline Health Center, Cornell University College of Veterinary Medicine
- Feline Lower Urinary Tract Disease, Cornell Feline Health Center
- Anorexia, Cornell Feline Health Center
- Noninfectious Diseases of the Urinary System of Cats, Merck Veterinary Manual, cat owners’ edition, by Scott A. Brown, VMD, PhD, DACVIM
- IRIS Staging of CKD (modified 2026), International Renal Interest Society
- Chronic kidney disease (CKD), pet caregiver information, International Renal Interest Society
Not a substitute for your vet
WagWatch is a tracking and logging tool, not a veterinary service. Its job is to help you bring a clear, accurate history to the people who care for your pet professionally.
Log it in WagWatch
Write your questions down before the next appointment, or add your cat in WagWatch and log tonight’s dinner with how much she ate. If she has stopped eating or is straining in the box, make the call first and log afterwards.
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