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Cancer In Cats: Types, Symptoms And Treatment

Cancer In Cats: Types, Symptoms And Treatment

The news that a cat has been diagnosed with cancer can be terrible news for loving cat caretakers. Join our Fremont veterinarians to learn about common types of feline cancer, as well as symptoms to watch for and available treatments.

Cancer In Cats

Although it's commonly believed that cats don't develop cancer at the same rate as dogs (about the same rate as humans), there is still research to be done on the topic. Regardless, there are a number of cancers that our beloved feline friends are more susceptible to developing, and knowing the types, symptoms and treatments can empower cat caretakers to help provide the best care for their pets.

Signs Of Feline Cancer

Although the symptoms of feline cancer will vary depending on the type, your veterinarian or veterinary oncologist will be focused on diagnosis, pain management, treatment and, if necessary, palliative treatment to maintain your cat's quality of life for as long as possible. Since cats are notorious for hiding signs of pain or illness until their case is quite advanced, knowing the signs to watch for can lead to early detection and a greater chance of successful treatment.

  • Lumps that change in appearance, sores, shabby or rough fur
  • Lack of energy, stiffness, rapid weight change (gain or loss)
  • Loss of appetite, consistent bouts of vomiting, difficulty eating
  • Change in litterbox use, struggling to pass urine or feces, diarrhea
  • Respiratory difficulties, foul oral odor
If you notice these signs in your cat, contact your local primary vet or veterinary oncologist right away to have your pet examined.

Common Types Of Cancer In Cats


As one of the most commonly diagnosed feline cancers, lymphoma has the ability to affect the lymphocytes (a kind of blood cell) and lymp[hoid tissues situated in many places throughout the body (e.g. lymph nodes, liver, bone marrow). It can be caused by other conditions such as feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV). Lymphoma can affect cats of anty age, breed, or sex, with the gastrointestinal tract being the most commonly affected area of the body.

Treatment options include chemotherapy, which most cats can tolerate with minimal side effects. In about 70% of feline patients, chemotherapy resulted in less presence of cancer (remission).

Squamous Cell Carcinoma (SSC)

Squamous cell carcinoma (SCC) is found in the cells of the oral cavity and is the most commonly seen kind of oral tumor in cats. The signs of SSC in felines usually show as dental problems (drooling, mouth odor, dental bleeding, trouble eating) that are examined by a veterinary professional who can identify SSC via biopsy.

Although surgery is recommended to address SSC in cats, unfortunately, cats' mouths are quite small in relation to the size of the tumor by the time it is usually diagnosed. If surgical intervention is deemed appropriate, sections of the upper or lower jaw will likely be removed to reduce the likelihood of the cancer invading other, deeper structures of the mouth.

Radiation and chemotherapy treatments are other options – but sadly, the majority of cats with SSC cannot be cured. If this is the case, the focus of your pet's compassionate veterinary team will be in keeping your feline friend as comfortable and pain-free as long as possible.


Fibrosarcoma is a cancer that impacts the soft tissues of the body and although slow to spread, is aggressive in the areas in which it takes hold. This cancer usually shows physical symptoms in the form of skin lumps or masses that doesn't seem to cause the cat pain. In more advanced cases, cats will show signs of dehydration, lethargy, and poor appetite.

Surgery is the usual initial treatment for fibrosarcoma, but it is likely that the tumor will return even with aggressive surgical removal of the growth. Because of this, radiation or chemotherapy is often recommended concurrently. With successful treatment, cats with this condition can live without the disease for 1 – 2 years.

Mammary Tumors

It may surprise you to know that mammary (breast) cancer is also common in cats, with up to 90% of mammary tumors being malignant (able to spread to other body parts). More advanced cases can see the tumors spread to lymph nodes and lungs, which is why early detection is key.

Surgically removing the mammary tumor, especially if the growth is small, is the most effective treatment. If the cat's condition has progressed (i.e. tumors are large, or lymph nodes are affected) then post-surgery chemotherapy might be advised by your veterinarian or veterinary oncologist.

Early Detection Is The Best Prevention

Take preventive steps like having your female cat spayed to lower the likelihood of them developing mammary cancer, getting your kitty vaccinated against feline leukemia, and ensuring they attend their routine veterinary checks to keep an eye on their overall health. Since there are several cancers for which the causes are unknown, early detection is key. You and your expert veterinary team are the first line of defense in your feline friend's fight against cancer!

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

Has your cat been diagnosed with cancer, or are you concerned about your pet's health? Contact our Fremont office to book an appointment so that your pet can receive the best care from our veterinarians.

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