It seems we are hearing more and more from friends and acquaintances that their beloved furbabies have been diagnosed with cancer. The one I’m hearing most is Lymphoma. Among my friends, four have had this experience. Another friend’s dog has an abdominal mass of unknown composition. I also follow a hobby blogger who told of her experience, not ever knowing her dog had cancer until he had to be taken to emergency and it was too late. He was behaving completely normally until his last day before crossing the Rainbow Bridge and raised no red flags whatsoever. What is going on with our pets and can we be more proactive to try to protect them?
I am not a vet, but have been reading to learn more about canine cancer, specifically Lymphoma. No part of this article is intended as advice. These are just some articles I have read and some points I found interesting. Please do your own research and choose your sources wisely. If you need specific personal information, talk to your vet or your pet’s oncologist.
What is Lymphoma?
Cancer of any kind, in people or pets, just sucks. Lymphoma is cancer of the lymphoid cells in the immune system. On biologyonline.com it is defined as, “Any of the cells that mediate the production of immunity, including lymphocytes, lymphoblasts, and plasma cells.” “Lymphocytes are a type of white blood cells.” There are B-cell and T-cell lymphocytes, and these also impact the effectiveness of treatment.
https://www.biologyonline.com/dictionary/lymphoid-cell
Research has identified at least 30 types of Lymphoma in dogs. These vary in symptoms, prognosis, and how quickly they spread. Lymphoma can be found in the lymph nodes, thymus, spleen or bone marrow but can be found in other locations as well. The most common lymphoma is multicentric lymphoma (80-85% of cases) and begins in the lymph nodes. It is very aggressive and fatal. Lymphoma in dogs is treated similarly to non-Hodgkins lymphoma in humans.
https://www.merckvetmanual.com/dog-owners/blood-disorders-of-dogs/malignant-lymphoma-in-dogs
https://www.webmd.com/pets/dogs/lymphoma-in-dogs
https://www.petmd.com/dog/conditions/cancer/c_dg_lymphoma
Predisposition or roll of the dice?
Research is being done to find out if there is a genetic predisposition in certain breeds of dogs getting Lymphoma. There do appear to be some breeds that have a higher probability of getting it, but any dog of any breed can get it. “For example, ~50% of Irish Water Spaniels and Flat-Coated Retrievers die of cancer, whereas cancer-related mortality is significantly lower in breeds such as Shih Tzus and Dachshunds.” (National Library of Medicine) Among American-bred Golden Retrievers, rates of cancer have been rising to around 60%, the highest of any breed.
Lymphoma is not a cancer of just senior pets. The median age is 5-9 years old. One friend’s dog was 8 the other only 5 when diagnosed. Yes it’s scary, but something we should at least be made aware of.
The Merck veterinary manual states, “Possible causes or contributing factors include viral infection, environmental contamination with herbicides, magnetic field exposure, genetic abnormalities, and dysfunction of the immune system.” In truth, the exact cause still remains unknown.
https://www.akcchf.org/educational-resources/library/articles/exploring-risk-factors-for.html
https://vet.purdue.edu/wcorc/cancer-research/canine-lymphoma-research.php
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3658424/
https://www.imprimedicine.com/blog/golden-retrievers



Why didn’t anyone tell us sooner?
I have almost always had a dog my entire life, and non-stop for the last 41 years. Yet I only just came to this realization recently. I personally find it rather disturbing and unsettling that the most common type of cancer in dogs, multicentric lymphoma, can be detected by enlarged lymph nodes. It is the first sign of it. There are other causes of enlarged lymph nodes, but lymphoma is definitely the biggest and most important one. Often there may be only a few, if any, obvious symptoms and when there are, the cancer may have already progressed considerably. Sometimes there are no symptoms at all, and pet owners are caught completely unaware.
But why are pet parents not made more aware of this? Shouldn’t this be as common knowledge among pet parents as puppy vaccines and the dangers of certain toxic foods like chocolate, raisins and onions?? How hard would it be for vets to make clients aware of this when they tell us about vaccines, flea treatment and preventative meds? Wouldn’t it be nice if all pet groomers would also know this as well? We can all feel around where lymph nodes are every time we bathe and groom our pets! We can ask our vet to show us, and explain what is normal and what is not. It’s not difficult or time consuming. Spreading this information could help!
https://wearethecure.org/learn-more-about-canine-cancer/dog-cancer-prevention
Early detection can lead to better outcomes, as in any cancer for anyone. Better to catch it at stage 1 than stage 4, right?

According to thevetiverse.com, “Dogs who have cancer but have not yet developed clinical signs tend to demonstrate improved outcomes, including patients with lymphoma, brain tumors, and mast cell tumors. Also, since these dogs do not need to be treated for clinical signs or stabilized prior to starting treatment, they are often easier to manage which may result in less emotional and financial burden for their owners. In short, early detection, whether it be early-stage detection or preclinical detection, has far-reaching benefits for dogs, their families, and their medical teams.”
https://www.thevetiverse.com/en/latest/cancer-in-dogs-part-i-the-importance-of-early-detection/
Promising new research
Research is ongoing to detect canine cancer earlier. In development and possibly nearing approval is a blood test. There are organizations conducting clinical trials on cancer. Check sites of veterinary colleges and veterinary organizations, as well as canine cancer sites, or ask a vet or oncologist. It is a heart-wrenching diagnosis and being informed can make you feel a little more empowered. Knowledge is power, pass it on!
https://www.avma.org/resources/pet-owners/petcare/cancer-pets
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9891508/
As a side note, treatments and prognosis vary as each case is different. There are many variables and completely depends on each individual pet and person.
On a positive note, chemo for dogs has come along way, with ongoing research. Dogs tolerate chemo very well compared to humans and they rarely get sick like they used to be. Also, many respond to treatment fairly quickly and can possibly live many more months, in some cases even longer. While still uncurable, remmission can give extra time to love and spoil furbabies. My friend with the 5-year-old dog had an extra 19 more months with her sweet boy.
Pet insurance plans are available from multiple providers, and a very good thing to have especially for susceptible breeds. Chemo treatments are expensive, but having pet insurance (best obtained when a dog is young) can cover most of the cost. Some people can even sign up for pet insurance through their employer’s health plan.
https://www.forbes.com/advisor/pet-insurance/best-pet-insurance/
https://www.marketwatch.com/guides/pet-insurance/pet-insurance-cost/
…And last but not least…








































