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  • Altered mental state (e.g., withdrawn, depressed, or confused)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

Why Is My Cat So Jumpy All of a Sudden? 8 Vet Reviewed Reasons 

It can be alarming to see your cat act jumpy all of a sudden, especially out of nowhere. Cats cannot tell us exactly...

230 Badass Cat Names for Tough & Ferocious Felines

Choosing the perfect name to encapsulate your cat’s unique personality is easier said than done, especially when they have a bold, take-no-prisoners attitude....

Do Cats Have Souls? Vet-Reviewed Science & Present-Day Opinions

If you’re a religious or spiritual cat owner, you probably believe that humans have souls, but things get fuzzier when it comes to...

How Seasonal Changes Affect Your Cat’s Behavior: Olga’s Routine Modifications

Hi, I’m Christopher! Read my introduction to learn more about me and my silly Russian Blue cat, Olga. When the temperature and humidity...

More related

Alex and His Strange Obsession: Nighttime Kitty Antics

Have you ever woken up in the middle of the night and thought, “What the heck is that noise?” What am I saying,...

How Do I Get My Cat Used to a Harness? 10 Vet-Approved Tips

As creatures of habit, cats dislike change. Something as simple as moving their litter box can cause them to get anxious and start...

Catify to Satisfy by Jackson Galaxy & Kate Benjamin (2025 Review)

The wait is over! The long awaited sequel to Jackson Galaxy and Kate Benjamin’s New York Times Bestseller Catification: Designing a Happy and...

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

Being a cat parent comes with many ups and a few unfortunate downs. We do our best to take care of our cats...

Keep reading

8 Best Cat Brushes in the UK in 2025: Reviews & Top Picks

A cat brush can be used to keep your cat’s hair in good shape. It can also remove mats of hair that are especially common in longhaired breeds, and certain types of cat brushes and cat combs can even be...

cat brushing a home

Can Cats Eat Spaghetti? Vet Reviewed Facts To Know!

It’s totally normal for loving pet owners to want to share their favorite foods with their feline companions. In many cases, this is a relatively harmless practice, though sometimes, it can be quite detrimental to your cat’s health. Spaghetti isn’t...

Can Cats Eat Spaghetti

Why Do Cats Fight? 8 Vet-Verified Reasons & How to Stop the Fighting

If you live in a multi-cat household, you may be familiar with spats among your feline friends. Referred to as inter-cat aggression, cat fights are stressful to pet parents and potentially harmful to the cats. In this article, we explore...

two cats fighting

How to Get Cats to Get Along: 9 Tips & Tricks

Getting a new cat seems like a great idea. You’ll have a new pet to love and care for, and your current kitty will have a new friend to nap and play with. However, some cats don’t get along. Instead...

young woman introducing two cats with each other

How to Make a Cat Less Skittish: 10 Vet Approved Tips & Tricks

While some cats love to meet new people and explore novel environments, others emphatically don’t. Particularly skittish cats will sometimes disappear entirely in the presence of visitors. While some cats simply prefer to be left alone, it’s often possible to...

bengal cat gives a high five paw to the owner

Can Cats Eat Bacon? Vet-Reviewed Facts & FAQ

It’s not a secret that bacon isn’t a particularly healthy food. We often think of bacon as a cut of meat not dissimilar to a steak or pork chop, but it’s not. Bacon is heavily processed, as it goes through...

Can Cats Eat Bacon

9 Best Cat Foods for Cats with Allergies in 2025 – Reviews & Top Picks

While food allergies are rare in cats, they can cause significant issues and discomfort for cats that are allergic to certain foods. It’s often challenging to find cat food that doesn’t irritate their skin or cause an upset stomach. When...

tabby cat eating from metal bowl

How Do Cats Show Affection? 12 Vet-Reviewed Body Language Cues

If you have a cat at home, you may wonder if your buddy loves you. And if so, how can you tell? Since cats can’t speak, it’s reasonable to wonder how they show affection. Cats show their love in several...

young woman holding cute siberian cat with green eyes