Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Kidney Failure in Cats: Vet-Reviewed Facts & When to Euthanize

vet checking cat on the table

Most of us wish our pets could live forever, but unfortunately, we dream the impossible dream. While no pet owner wants to face saying goodbye to their animal, many have to decide when to euthanize a pet. The decision is never easy, but it can be especially tough if your cat suffers from a health condition that can persist for years, like chronic kidney disease.

While I’ve found from experience, having euthanized three pets and worked for two decades as a veterinary nurse, that there’s no right answer to the question of when to euthanize, there are ways to make the solution clearer. In this article, I’ll go over some ways to help you decide when to euthanize a cat with kidney failure, including a system to help you evaluate your kitty’s quality of life.

divider 3 paws

What Is Kidney Failure In Cats?

Understanding kidney disease in cats is an integral part of deciding when to euthanize, and I will give a brief outline of the basic pathology of kidney failure. Kidney failure is the end stage of a process that can take weeks to years. Kidney disease is one of the most common medical conditions in older cats. It occurs when the kidneys, whose normal function is to filter the waste products of normal bodily functions from the blood, start to malfunction.

As the kidneys stop filtering the blood effectively, the waste products left behind build up in the body. Eventually, they start to impact other body systems and poison the cat from the inside. You’ll likely notice your cat start drinking and urinating more frequently, along with other signs like vomiting, weight loss, and decreased appetite.

Depending on how badly the kidneys are affected and how they respond to treatment, cats with chronic kidney disease can sometimes live for years after the first diagnosis. In most cases, the organs eventually stop working, and the cat will be in kidney failure.

At that point, it’s only a matter of time before you’ll face a tough decision.

Some physical signs you might notice include:
  • No appetite
  • Excessive drinking and urinating
  • Not urinating at all
  • Vocalizing
  • Altered mental state (e.g., withdrawn, depressed, or confused)
  • Sores in the mouth or drooling
  • Trouble walking or getting around

If your pet is showing these signs, we suggest you speak to a vet.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

Once these appear, you’ll need to consider whether it’s time to euthanize, and we’ll talk about the ways to decide that in the next section. Acute (sudden) kidney failure is most commonly seen following the ingestion of a toxin (such as ethylene glycol, aka antifreeze) but can also result from severe dehydration and urinary tract infections.

In the cases of toxin-induced kidney failure, the damage to the organs is often irreversible, and the decision to euthanize may need to be made quite suddenly, whereas kidney damage from an infection, obstruction, or dehydration can often be corrected with aggressive fluid therapy and medical treatment.

The clinical signs of acute kidney failure are often similar to those seen with chronic disease but occur within a period of days or even hours (as with antifreeze toxicity).

cat owner talking to the vet while examining the cat
Image Credit: Stock-Asso, Shutterstock

divider 3 paws

When to Euthanize a Cat With Kidney Failure

There is no simple answer to this question, and no one can decide for you. However, I suggest considering two primary concerns as you make your choice: your available resources and your cat’s quality of life.

Available Resources

As mentioned, cats with chronic kidney disease can survive for years with treatment. Even once they enter kidney failure, aggressive treatment may be able to prolong your cat’s life even further. However, the treatments can take a toll on your finances, time, and emotions.

When making decisions about treatment and euthanasia, it’s important, however difficult, to consider the resources you have available. How much money can you afford to spend on vet bills? The treatment of kidney failure may include hospitalization with intravenous (IV) fluids, medications, and sometimes (though rarely)  blood transfusions or tube feeding.

Treating a cat with kidney failure can be expensive, but it can also be stressful and time-consuming. Watching your cat get sicker and not knowing when to say goodbye can take a toll on your emotional resources.

veterinarians examining a grey cat
Image By: Juice Flair, Shutterstock

Your Cat’s Quality of Life

Even if you have unlimited resources, your cat’s quality of life should be the most important indicator of when to euthanize. Determining when their quality of life reaches the point of no return will be different for every cat and every person. At its simplest, ask yourself whether your cat is having more good days than bad.

Does your cat still seem relatively happy, interested in interacting with you, eating, and comfortable? If so, your pet may not be experiencing the most severe effects of the disease. Some owners rely exclusively on their knowledge of their pet’s behavior and personality to assess how they’re feeling.

If you prefer a more “data-driven” way to determine your cat’s status, various quality-of-life scales for pets are available (follow this link for one example). Essentially, the scales ask you to rank your cat’s daily life on a scale of 1-10. For example, is your cat pain-free, clean, still eating, responsive, and able to move around independently?

If the numbers add up to more than half the total, most scales will rank your cat’s quality of life as acceptable. Once they drop lower than half, it’s probably time to talk to your vet about euthanasia.

divider 3 paws

Can You Let Your Cat With Kidney Failure Die Naturally?

Because choosing to euthanize is so difficult, many of us would prefer that our cats pass away peacefully in their sleep. In some cases, that may happen, but some “natural” deaths can be disturbing to experience. You may find the mental toll of waiting and wondering if you’re making the right choice difficult.

In addition, you don’t want your cat to be in pain simply because you can’t decide whether to euthanize them. Kidney disease can be painful, especially if your kitty develops mouth sores. Ask your vet about pain control options if you’re still not ready to euthanize. Sometimes, by prolonging their lives, we are merely prolonging their suffering.

divider cat paws 2 oct 2024

Conclusion

When deciding when to euthanize a cat with kidney failure, you’ll need to consider your pet’s quality of life, along with the financial, emotional, and time resources you have available to continue care. Your vet and their staff can assist you as you make this difficult decision, but the final choice will ultimately be yours.

Every situation is different; unfortunately, recognizing when the time is right to say goodbye won’t always be easy. I can also say from experience that even if you know euthanizing is the right choice, you’ll probably still second-guess yourself once you’ve made it. These feelings are normal, and pet loss support resources are available to help you navigate them.


Featured Image Credit: Natali _ Mis, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

10 Adorable DIY Cat Christmas Tree Toppers You Can Make Today (With Pictures)

Christmas is a magical time of year. Whether you celebrate with a huge family, or keep things small, great decorations are a must....

Are TNR Programs for Feral Cats Ethical? Vet-Verified Facts & FAQ

Roughly 3.3 million cats enter shelters annually, with many of these cats being euthanized.1 Many felines are strays that escaped their homes, with...

Can Cats Survive On Their Own By Hunting Wildlife? Vet-Approved Explanation

Cats are predators; even those who prefer to spend their time curled up in comfortable beds have the bodies and instincts of skilled...

How to Cat Sit: 11 Expert Tips

Pet sitting has become a popular side hustle for many people, with some people even turning it into a full-fledged business. If you’re...

More related

Do Cats Like Hugs? Feline Preferences & Important Considerations (Vet Verified)

Cats are beloved pets known for their independent and enigmatic nature. While dogs often enjoy hugs and physical affection, the same may not...

6 Tips for Sharing Your Home with Cats You Must Know

When we decide to welcome a cat into our home, we can expect a few changes to occur. Your bathroom will have a...

100+ Popular Cat Names in 2025: Top Choices For Your Furry Feline

Roughly 46.5 million American households have opened their homes to at least one cat. Dogs may outnumber felines, but we love cats just...

National Pet Insurance Month: 2025 Update & Interesting Facts

September is National Pet Insurance Month every year. As you might expect, this month is focused on helping pet parents get the information...

Keep reading

How To Get Rid of Fleas on Kittens: 7 Vet Approved Steps

You may be wondering what to do if you’ve recently adopted or are fostering a kitten and have seen telltale signs of fleas, such as biting and scratching. Dealing with fleas requires several steps; the kittens and the environment require...

american shorthair kitten

Alternatives to Declawing Your Cat: 8 Humane Options

On paper, declawing your cat might seem like a simple way to stop your furniture from being ripped to shreds, but the reality is that it’s a cruel and painful operation that can lead to long-term pain, discomfort, and behavioral...

cat claw

Can Cat Pee Make You Sick? Vet-Verified Facts & Safety Tips

We all know that cat pee smells awful, but did you know that cat pee can be harmful to you and can cause allergic reactions in people who are allergic to cats? But just how dangerous is cat pee, can...

cat-peeing-on-the-bed

Bombay Cat Health Problems: 5 Common Issues

The Bombay Cat is an adorable medium to large cat with sleek and short black hair. They’re a mix between the Burmese and American Shorthair. Bombay cats are a generally healthy breed that is also athletic and surprisingly heavy due...

Catster_Health Problems of Bombay Cat

How to Save a Cat From Choking: Can I Do the Heimlich Maneuver? Vet-Reviewed Guide

True choking occurs when something is stuck at the very back of the throat, which leads to the windpipe being obstructed. This often occurs when the animal doesn’t chew thoroughly or eats something that they shouldn’t. Fortunately, cats are quite...

cat cough

Can Cats Eat Pastrami? Health Advice & Alternatives

We come back to our plate to find that our precious kitty has helped themselves to our pastrami sandwich, and we have no idea whether it’s toxic to them. Unfortunately, this happens often to cat parents. It feels nearly impossible...

Can Cats Eat Pastrami

How to Get Your Cat to Cuddle: 5 Vet-Approved Tips for Better Bonding

It’s most cat owners’ dreams to have a cute and cuddly cat that sits on their laps and curls up with them in bed, but this isn’t always the case. Like humans, cats have unique personalities, and while some cats...

cat enjoying cuddle

Can Cats Eat Cooked Fish? Vet-Reviewed Facts & FAQ

It happens to every cat owner sooner or later. Moments after sitting down to a nice seafood dinner, they begin to feel the watchful gaze of their kitty on them, imploring them to drop something. That’s when they ask themselves...

Can Cats Eat Cooked Fish