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

Share

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.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Chatting About the Rainbow Bridge, Euthanasia, and Laughter During Grief | Chatty Cattys, Episode 24

If you’ve ever felt the loss of a beloved cat, or are dreading the day when your pet crosses the rainbow bridge, you’ll...

The Simple Reasons Cats Refuse to Let Anyone Use the Bathroom Alone

Cats have an extraordinary talent for making themselves present in the most inconvenient places, and the bathroom ranks near the top of the...

A Paw-sitive Milestone: Canada Officially Becomes a Declaw-Free Nation

Canada has officially become a declaw-free nation. On May 25, 2026, a new regulation was filed in Ontario under the Provincial Animal Welfare...

The Surprisingly Simple Ways to Help a Cat With Hairballs

Cats spend an astonishing amount of time grooming. It is part hygiene routine, part comfort ritual, and part instinct that traces back generations....

More related

11 Best Toys for Active Cats in 2026 – Reviews and Top Picks

When some of us think of pet cats, we picture an overweight feline lounging in the sun for hours on end, waking just...

Rectal Polyps in Cats: Our Vet Explains the Causes, Signs & Treatments

If your cat is straining to pass feces, or you’ve noticed some blood in their poop, there are several possible reasons this could...

5 Vet Approved DIY Slow Feed Cat Bowls (With Pictures)

Eating too quickly can lead to stomach upset and health problems, but it is commonly associated with dogs. That doesn’t mean some cats...

How Long Does Catnip Take to Kick In? Effects & Tips (Vet-Verified Info)

Many cat owners have witnessed the effects of catnip on their feline companions, and most people agree it’s pretty entertaining. Catnip (Nepeta cataria)...

Keep reading

Can Cats Eat Salami? Vet-Reviewed Risks & Healthy Alternatives

Since cats are carnivores, it may seem like they can enjoy eating different kinds of meat humans consume, such as cured meat. However, whether cats can eat cured meat is a question that isn’t very cut and dry. Although some...

Can Cats Eat Salami

Why Does My Cat Lay on My Chest? 5 Vet-Reviewed Reasons for This Behavior

Why does my cat lay on my chest? It’s a common question from cat parents everywhere, and for good reason. If you’re lying on the couch reading a book or watching a movie, many cats will take the opportunity to...

Child playing with cat at home

Can Cats Eat Rice Krispies? Vet Approved Facts & FAQ

Rice Krispies are a beloved breakfast cereal made from puffed rice. Kids love this sweet food for its fun popping sound. Some may want to share this tasty treat with their kitty, but is this a safe snack for cats?...

Can Cats Eat Rice Krispies

Ways to Calm Your Cat in the Car: 11 Vet-Reviewed Methods

Some cats don’t enjoy traveling in a car. Whether it’s a short trip to the vet’s or a road trip across the country to stay with family, they can become visibly distressed, yowl loudly, and scratch their carrier in an...

Cute white British Shorthair cat inside pet carrier in car

Can Cats Eat Lasagna? Vet-Approved Nutritional Facts

If you were brought up watching Garfield on television or reading the comics, you might come into the world of cat ownership thinking that cats (a) hate Mondays and (b) love lasagna. While both might be true, it’s impossible to...

Can Cats Eat Lasagna

Why Is My Cat So Hyper All of a Sudden: 8 Possible Reasons (Vet Reviewed)

For some cats, it is not rare that they will have a moment of wildness and suddenly charge around the house. For others, it can be a surprising and sudden occurrence. While it might simply be a case of your...

cream tabby maine coon cat playing water

What to Feed a Kitten: Vet-Verified Guide For Each Stage

Proper feeding and nutrition are essential for kittens to grow into healthy adults. Kittens reach the weaning stage around 4-5 weeks of age. They should ideally remain with the mother until an absolute minimum of 8 weeks of age (12...

Kitten eating food from bowl

Is Cedar Poisonous to Cats? Vet Approved Facts & FAQ

Any loving cat parent wants a heads-up as to which substances or plants can be poisonous to felines. If you’re wondering whether cedar trees are toxic to cats, unfortunately, yes, cedar can be poisonous to cats—some cedar trees are, in...

Catster_Is Cedar Poisonous to Cats

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.