Treating Dog Cancer. Is Chemo A Good Choice?

Mary Simpson
by Mary Simpson

Unlike human-grade chemo, the options for your dog may be just the ticket to improving his life.

(photo credit: Beatriz Vera / shutterstock.com)

My dog has cancer. Not for the first time. Nor the second or third time. But for the fourth time in three years. Unlike an internal cancer, this variation is considered an aggressive squamous cell carcinoma, and it had initially been successfully removed from the side of her beak back in 2023. Then it came back in 2025 on her eyelid, followed by a recurrence later that year. Both times, surgical intervention was used to remove the growth.


Now, my veterinarian is talking about a more aggressive approach, including both removal of the tumour as well as radiation or chemotherapy. And that’s something I initially balked at three years ago. But it’s amazing how quickly you can come round to a treatment when it appears to be the only way to keep this disease at bay.


After reading up on it and speaking with a friend about their experience with dog chemo – their pet is currently completing round six of eight treatments – I’m feeling a little more optimistic about not only a life-extending outcome but how a process I had originally assumed would be too aggressive and might compromise her quality of life, just may be the way to go.


Here’s What I Learned.

While chemotherapy is not a cure, it’s been proven highly effective at treating a wide range of cancers in dogs, and it can be successful at both extending and improving your pet’s quality of life. From my friend, I’ve heard that his small dog is tolerating the treatment surprisingly well and seems to be improving.


So those earlier images I had of humans struggling with weight and hair loss while undergoing these debilitating treatments felt a little less daunting. Now, I’m less deterred by this approach, and the thought of choosing radiation or chemotherapy as a part of my dog’s treatment is something I’m keen to explore.


Here's Why Dog Chemo is Different from Human Chemo

Human-grade chemotherapy uses a barrage of powerful chemicals that are designed to disrupt the rapidly dividing cancer cell cycle with the end goal of curing the disease. For dogs, the doses are much lower with the intent being to drive remission and enhance your pet’s quality of life.


As a result, the doses given to dogs are much lower than human - hence the side effects are milder. In fact, in most cases, dogs experience no side effects at all – including hair loss.


How is Chemo Therapy Delivered to Dogs?

The method is dependent on the type of cancer, but the three main formats for chemotherapy treatment are through oral medications, injections made directly into the tumour or muscle, as well as the intravenous (or infusion) format that goes into the bloodstream for cancers including lymphoma.


What’s the Difference Between Chemo and Radiation?

Chemotherapy is used as a systemic treatment that targets the entire body. It would be used in instances of cancers such as lymphoma or when tumors have advanced to other parts of the body. Known as metastasizing.


Radiation is a more targeted approach to tackling cancerous tumours. The localized application is directed at individual growth, both pre- and post-surgery. And where chemotherapy is administered either orally or intravenously, radiation is a single beam directed at the cancerous cells.


Mary Simpson
Mary Simpson

Sharing space with three seriously judgy Schnoodles and 2 felines who prefers to be left alone. #LivingMyBestLife

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