November is National Pet Cancer Awareness Month, which makes it a good time to learn more about this kind of illness. This month-long event is held in order to raise awareness of pet cancer, such as making sure pet parents know what symptoms to watch for and how common pet cancer is. Since cancer is among the top disease-related causes of death in pets, it’s important for pet parents to keep the following information in mind.
Pet Cancer by the Numbers
How many pets end up with cancer? Some pets develop tumors or neoplasms, which can be malignant or benign. Benign tumors are not cancerous, while malignant tumors are cancerous. According to the American Veterinary Medical Association (AVMA), roughly one in four dogs develop tumors at some point in their life. Some of these tumors are benign, while others are malignant. In dogs that are 10 years old and up, nearly half end up developing cancer. According to the Animal Cancer Foundation, around 6 million new cases of cancer are diagnosed in dogs each year in the U.S. This number is similar for cats as well.
Symptoms of Pet Cancer
Cancer in pets can affect different parts of the body, such as the bladder, brain, liver, bones or spinal cord. The kinds of symptoms that occur can differ depending on which organ or part of the body is affected. However, there are some common symptoms that can occur with pet cancer. Some of these include the following:
- Rapid and unexplained weight loss
- Appetite loss
- Trouble breathing or other respiratory changes
- Frequent diarrhea and/or vomiting
- Wounds that do not heal
- Bumps or lumps
- Skin discoloration
- Unexplained swelling
- Trouble eating
- Bleeding from the nose or other openings in the body
- Lack of energy
What to Do About Pet Cancer Symptoms
If you notice any possible symptoms of cancer in your pets, you should bring them to your vet for an exam as soon as possible. Your vet can check your pets for other signs of cancer and perform diagnostic tests. Keep in mind that other health conditions can cause symptoms that are similar to cancer symptoms, so it’s important to have your pets examined and receive an accurate diagnosis. If cancer is found, your vet can discuss treatment options with you.
What to Do During National Pet Cancer Awareness Month
You can help raise awareness of pet cancer during November by sharing information on this type of illness and encouraging others to have their pets examined if they notice any symptoms. This is also a good time to remind fellow pet parents about the importance of routine wellness exams for pets, so that vets can find possible signs of cancer earlier rather than later.
AMANDA on Aug 05, 2026
I believe I’ve lost 2 pets to cancer i lost my bullmastiff this past Wednesday October 29,2025 he just stop eating starting having bloody diarrhea and throwing up did all kinds of test but never found out why or what was every wrong with him and 2 years ago I lost my bulldog at 10 out of the blue started having seizures
in January of 2023 they told me it was an inner ear infection the seizures continued she began to loose the ability to walk and lost her life June 15th of 23 so I can feel everyone’s pain cancer has hurt me since I was 4 when my mother past and my brother was 2