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.

Mouth Cancer in Cats: Vet-Reviewed Signs & When to Euthanize

cat mouth check by vet

One of the most difficult parts of pet ownership is making end-of-life decisions. Knowing when to euthanize a beloved animal companion is never easy, and there’s no right answer for every situation. Personally, I’ve had to make that choice three times, and for each pet, my reasoning was different.

Unfortunately, some medical conditions don’t leave you much time to decide, and mouth cancer in cats is often one of them. Mouth cancer typically impacts the cat’s ability to eat and breathe as it progresses, and it’s generally time to euthanize once that happens. In this article, we’ll discuss some specifics about mouth cancer in cats and factors that may impact when to euthanize.

divider cat paws 2 oct 2024

Mouth Cancer in Cats: The Basics

The most common type of mouth cancer in cats is a tumor called oral squamous cell carcinoma.1 This tumor is typically found in older cats and grows from the gums or under the tongue, eventually infiltrating the bones of the jaw.  Unfortunately, because of the location of this cancer and a cat’s tendency to hide illness, these tumors are rarely found early enough for successful treatment.

Signs of mouth cancer in cats include:

  • Difficulty eating
  • Weight loss
  • Painful mouth
  • Blood from the mouth
  • Bad breath
  • Face or jaw swelling
  • Loose teeth

Possible treatments for mouth cancer in cats include surgery, chemotherapy, or radiation. Even with treatment, this cancer typically has a bad prognosis and progresses quickly. Owners may choose just to keep their cat comfortable until it’s time to euthanize.

If your cat shows signs of the symptoms above or you suspect they might be suffering from underlying health issues, you should contact your vet.

Factors That May Impact When to Euthanize a Cat With Mouth Cancer

If a cat with mouth cancer is reluctant or unable to eat, a feeding tube may be an option for some owners, especially if treatment such as radiotherapy is going to be pursued. Your vet can discuss the pros and cons of using a feeding tube. Feeding tubes allow you to get medications, food, and water into your cat without touching its painful mouth.

Keeping your cat fed and comfortable may keep their quality of life acceptable longer before it’s time to euthanize them. However, it’s essential to remember that if your cat isn’t eating, it’s most likely because they’re in pain. Even if the feeding tube can technically prolong their life, you’ll need to consider the quality of that time too.

Depending on the tumor’s location, mouth cancer may eventually disrupt your cat’s breathing. Once that happens, there’s typically little you can do to fix it, and your decision to euthanize may become more apparent.

Sick cat, IV, dehydration, dropper
Photo Credit: Vladimir Gudvin, Shutterstock

Evaluating Your Cat’s Quality of Life

For any decision to euthanize, the timing typically comes down to evaluating the pet’s quality of life. Is your cat still engaged and interested in their daily routine and interacting with you? This evaluation will be different for each owner.

Veterinarians have also developed an end-of-life scale using numbers that may help some owners make their decision. This scale looks at seven categories, including pain, nutrition, cleanliness, ability to move around, and how the pet interacts and responds to the owner. Owners score each category on a scale of 1-10, with an overall score over 35 indicating an acceptable quality of life.

Once a cat has more bad days than good, it’s probably time to discuss euthanasia with your vet. This numbers system won’t work for every owner, but it does offer an objective way to help evaluate your cat’s quality of life if you’re struggling to make your final decision.

Veterinarian giving injection to cat
Photo Credit: Africa Studio, Shutterstock

divider cat paws 2 oct 2024

Conclusion

Mouth cancer in cats is typically a fast-moving disease that quickly affects functions like eating and breathing. Because of that, knowing when to euthanize a cat with mouth cancer can be more straightforward than other medical conditions, but that doesn’t make the choice any easier. If you’re like me, you’ll struggle with knowing when to euthanize, and when you do make the decision, you’ll probably second-guess yourself too.

These feelings are normal, even though you may know in your heart that you made the kindest choice for your painful cat. Ask your veterinarian about support resources or groups if you are struggling. Knowing you aren’t the only pet owner who feels the same way can be helpful as you work through your grief.

See also:


Featured Image Credit: mojahata, 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

How Long Do Cats Remember People? Feline Memory Explained

Imagine this: you are preparing to spend your summer vacation in another country to visit your family. You pack everything you need, and...

Hemp Oil vs CBD Oil for Cats: Is There a Difference? Our 2025 Vet-Reviewed Comparison

Making sure their feline is safe, happy, and healthy is the priority of every cat owner. Providing healthy food, a clean litter box,...

10 Best Food for Cats With IBD in 2025 – Reviews & Top Picks

We all want to feed our cats the best food, but when they have irritable bowel disorder (IBD), finding it can be a...

29 Best Gift Ideas for Cats in 2025 – Reviews & Top Picks

Gift-giving season is always a bit nerve-wracking, largely due to the possibility that you might end up buying the wrong gift or even...

More related

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...

10 Best Cat Deshedding Tools in 2025 – Reviews & Top Picks

With over 58 million pet cats around the nation, it’s no shock that there are tons of cat deshedding tools on the market....

What’s an F1 Savannah Cat? What Are They Like?

F1 Savannah cats are first-generation Savannah cats. In other words, they are 50% serval and 50% domestic cat. The “F” stands for filial...

10 Christmas Cat Stocking Stuffers to Make Your Kitty Happy

The holidays are the best time to spoil your kitty with something special in their Christmas stocking. Cats can’t have too many toys,...

Keep reading

Can Cats Eat Cauliflower? Vet-Verified Nutritional Facts & FAQ

Here’s a mystery: You set a piece of cauliflower down on your plate, turn around for two seconds, and then realize that the cauliflower has disappeared. Is your house haunted? Did the cauliflower transport into a different dimension? None of...

Can Cats Eat Cauliflower

10 Senior Cat Health Problems: Vet-Verified Common Issues

Like people and other animals, cats start to show signs of aging as they reach their senior years. Typically, 10 years is considered to be senior for a cat, although many do go on to live to 17 or 18...

Catster_Health Problems of Senior Cat

Can Cats Eat Truffles? Vet-Reviewed Facts & FAQ

Cats are carnivores, so they don’t need to eat plant foods to stay healthy. However, this doesn’t mean that they cannot eat them. In fact, some cats seek out foods like carrots and grapes because they like the texture or...

Can Cats Eat Truffles

9 Best Cat Foods for Diarrhea in Canada in 2025: Reviews & Top Picks 

As lucky as we are to parent our fluffy family members, it isn’t a job that comes without some pretty gross cleanups, smells, and, of course, worry. If your cat has a sensitive stomach, they may suffer from diarrhea among...

grey cat eating food

Can Cats Eat Gum? Vet-Approved Facts & FAQ

Chewing gum comes in several flavors, and the scent can pique a cat’s curiosity, especially if it’s wrapped in shiny foil. So, it’s pretty easy for cats to accidentally take a bite or get it stuck on their face and...

Can Cats Eat Gum

Is It Better to Have Two Cats (or More)? Factors to Consider & Tips

Cats are some of the most misunderstood animals. Many ideas people have about them are anecdotal or based on folklore. We know that they are closer to their wild side, and many of their behaviors are instinctive, such as chasing...

two cats side by side each other

Can a Cat Sense Fear? Vet Reviewed Answer

We all know that cats do an excellent job of comforting us when we’ve had a rough day. All we need is to sink our fingers into their soft fur and feel their purr rumbling under our hands to feel...

white cat under the bed

Why is My Cat Breathing So Hard? 9 Vet-Approved Reasons & What to Do

Just like dogs, cats may breathe heavily and pant in certain circumstances. Because this behavior is much rarer in cats than in dogs, it is usually something to be worried about, especially if it persists for prolonged periods. Panting is...

close up white cat breathing