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.

Cat Mammary Cancer: When to Euthanize: Vet-Approved Guide & FAQ

vet checking up the cat

You know that you’ll have to make a difficult decision when you find out that your beloved pet is reaching the end of their life. Unfortunately, mammary cancer is one of the most aggressive forms of cancer in cats, and it can take an emotional toll on both you and your pet. To make an informed decision about euthanasia, you should understand the signs and progression of this disease.

divider cat paws oct 2024

What Is Mammary Cancer?

There are different types of mammary cancer that can affect cats but the most common is mammary carcinoma. This tumor forms firm swellings or nodules in the mammary glands of cats. It is most commonly seen in older female cats that have not been spayed. Unfortunately, this cancer often spreads to other mammary glands, lymph nodes, and the lungs.

A cat having a check-up at a small animal vet clinic
Image Credit: Tyler Olson, Shutterstock

Prognosis

If mammary tumors are caught early and surgically removed before they have spread, the treatment is much more likely to be successful, and the prognosis is better. Vets will usually do further diagnostic tests, such as X-rays and ultrasound, to assess how far the cancer has progressed and to be able to give a better idea of the prognosis. Sometimes, chemotherapy will also be offered.

divider cat paws oct 2024

Signs It Might Be Time to Euthanize a Cat With Mammary Cancer

Unfortunately, cat mammary cancer is an aggressive cancer, and treatment is not always successful. Even after surgical excision, the cancer can either recur within the mammary glands or have already spread elsewhere in the body. Deciding when to euthanize your pet can be an emotional and difficult process, but it may be necessary for humane reasons if their quality of life is significantly compromised.

cat owner man talking to veterinarian
Image Credit: silverblackstock, Shutterstock

How Will I Know When It Is Time to Euthanize My Pet?

Your veterinarian will be able to assess your pet’s condition and advise on whether euthanasia is the best course of action. Ultimately, the decision is up to you as the owner, but it can be helpful to consider factors such as quality of life and pain levels.

Signs that it may be time to discuss your cat’s quality of life with a vet include:

  • Your cat has lost their appetite.
  • They have significant weight loss.
  • They are weak and lethargic and have trouble moving around.
  • They are not taking an interest in things they normally enjoy.
  • They are having difficulty breathing.
  • The tumors in their mammary glands are ulcerated and open.

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

divider cat paws oct 2024

What Is the Process of Euthanasia Like?

The veterinarian may provide your pet with a sedative to keep them calm if they are nervous or agitated, and then an injection is given that is designed to quickly and peacefully end their life. The injection is an overdose of an anesthetic, and your cat will quickly lose consciousness and won’t feel pain. Death occurs within a few minutes when the heart stops beating.

How Can I Cope With the Loss of My Pet?

Losing a beloved pet can be emotionally devastating, especially if they have been living with a terminal illness. It is important to remember that you are not alone and that there are resources available to help you through this difficult time. Talking to a veterinarian or friends and family members who have had experience with pet loss can be very helpful. You may also find comfort in joining a local pet loss support group or talking to a counselor who specializes in grief and bereavement counseling.

Are There Any Resources to Help Me Through This Process?

Yes, there are a number of great resources available to assist you in coping with pet loss and the decision to euthanize your pet. A veterinarian or animal hospital can provide advice and support, and there are many online support groups and websites dedicated to pet loss.

divider cat paws oct 2024

Choices for Honoring the Remains of Your Pet

Once your pet has passed away, you may find solace in honoring their memory. There are a number of options available for this, such as burial or cremation. Burial can be done on your property if allowed by local laws or at a pet cemetery. Cremation is another option, and the ashes can then be scattered in the place of your choosing or kept as a memento.

cremated remains of a pet cat
Image Credit: umaruchan4678, Shutterstock

Special Ways to Remember Your Cat

No matter how you choose to honor the remains of your pet, there are also special ways that you can remember them. You may want to consider writing down your favorite memories or creating a photo album of your time together. You could even plant a memorial tree or create an online memorial where friends and family can share their own stories and fond memories.

Facing the Loss of Your Pet

The loss of a beloved pet can be devastating, but it is important to remember that you have done all that you can for them. Taking care of your emotional well-being during this difficult time will help ensure that you can cope with the grief in a healthy manner. It is okay to take some time for yourself and lean into support from family and friends if needed. Remembering the happy memories of your pet and honoring their memory are powerful ways to move forward and begin healing.

divider cat paws oct 2024

Conclusion

Making the decision to euthanize a beloved pet due to mammary cancer is never easy. However, understanding the signs, diagnosis, and prognosis can help you make an informed and compassionate decision. Be sure to consult with a veterinarian on any questions or concerns you may have about the condition of your pet and whether euthanasia might ultimately be best for your cat.


Featured Image Credit: PRESSLAB, Shutterstock

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

Cat Bladder Cancer: When to Euthanize (Vet Explained Signs & Advice)

Having to make the decision to euthanize a beloved companion is one of the hardest parts of being a pet parent. Even if...

vet checking bengal cat

Ear Cancer in Cats: Causes, Signs & Care (Vet Answer)

Ear cancer is a relatively common occurrence in cats. Two main types of tumors affect a cat’s ears. These are ear canal tumors...

cat-with-ear-infection

Pregnant Cat Nipples vs Normal: Vet-Verified Differences Explained

Both male and female cats have nipples, but the female’s nipples will change during and after pregnancy to accommodate the nutritional needs of...

male hand touching the pregnant bacl and white cat's belly

Why Euthanasia Is A Gift: Dr. Karyn Explains

Hi, I’m Dr. Karyn! Read my introduction to learn more about me and meet my five hilarious cats: Clutch, Cyril, Alex, Zelda, and...

Tate and Clutch - sun worshippers

More related

picture-and-urn-of-deceased-cremated-cat

How Much Does It Cost to Cremate a Cat: 2025 Update

After a cat’s death, several decisions must be made, including what to do with their body. Planning ahead is vital, and the overwhelming...

cremation for pets

World Pet Memorial Day – How and When Is It Celebrated?

World Pet Memorial Day, which takes place yearly on the second Tuesday of June, is a day to remember and celebrate beloved pets...

acute glaucoma in adult cat's eyes

Cat Glaucoma: Signs, Causes, Diagnosis, Care & FAQ (Vet Answer)

Cats are capable of developing glaucoma, just as humans do. Glaucoma is a medical condition seen when high pressure builds up inside the...

close up longhaired brown tabby cat

Cat Brain Anatomy: Vet-Verified Facts & Common Disorders

Anyone who knows a cat is familiar with just how different they act from humans. Sometimes, they do things that leave us feeling...

Keep reading

Why Does My Cat Fart When I Pick Him Up? 5 Vet-Reviewed Reasons

As much as you love your cat, there are times when they can be a little gross. Times like when they repeatedly shove their butt in your face or the way they can fart when you pick them up. While...

male owner holding his devon rex cat

Healthy Cat Ears: 6 Vet-Verified Care Tips

Like dogs, cats need a regular grooming routine to stay healthy. Brushing your cat is key, especially if they have long hair, but did you know you should also check your cat’s ears regularly? This is to prevent ear infections,...

owner-checking-his-cats-ear

6 Best Cat Cleaning Wipes in 2025 – Reviews & Top Picks

It’s no secret that our felines can get messy occasionally. Whether rubbing their leftover bathroom particles across your carpet or running through the house with muddy paws, wipes can be handy for cleaning up after our frisky kitties. If you...

hand wiping an orange cat with pet wipes

How Often Should I Feed My Cat? Vet-Reviewed Considerations & Tips

Next to feeding your cat just the right amount, you should also concern yourself with how often to feed your feline. There isn’t actually a one-size-fits-all answer for this. In many cases, it will depend on your schedule and your...

tabby cat eating cat food out of bowl inside

8 Best Grain-Free Kitten Foods of 2025 – Reviews & Top Picks

Adding a new kitten to your family is an incredibly exciting time, but it’s also one that requires many decisions! From what sort of bed your kitten should sleep in to what toys to buy them, there’s so much to...

kitten eating cat food

How to Approach a Scared Kitten: 6 Steps & Tips

Finding a scared kitten can throw anyone off guard, leaving you wondering what to do and how to help. Many factors and scenarios come into play as to why you’ve found a scared kitten. An irresponsible owner could have dumped...

Cute munchkin kitten on purple bed

Is It True That All Cats Have Carpal Whiskers on Their Legs? Feline Anatomy Explained

There’s no question that cats are unbelievably adorable. Everything from their gorgeous eyes to their tiny little paws is nothing short of cuteness galore. But one often overlooked feature that adds to this cuteness is the whiskers. Everyone knows that...

Close up to a ginger cat paws and claws scratching carpet

Can Cats Drink Oat Milk? Vet-Reviewed Facts & Safety Guide

While we try to lead more active lives and make smarter food choices, it’s sometimes easy to forget that the same considerations don’t apply to pets. So, can cats have oat milk? The fiber and vitamin-rich replacement for cow’s milk...

Can Cats Drink Oat Milk