Tumors of the lymphatic system in dogs (Lymphoma, Lymphosarcoma)
- Occurrence: common
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Das Wichtigste auf einen Blick
Lymphomas are Tumors of the lymphatic system in dogs that arise from uncontrolled proliferation of lymphocytes. These malignant cells can accumulate in the lymph nodes and form Tumors or spread throughout the body. The exact causes are often unknown, but genetic factors, environmental factors, and viral infections can play a role. Certain dog breeds, such as Golden Retrievers and Boxers, are particularly susceptible to lymphomas. Symptoms may include enlarged, firm lymph nodes, loss of appetite, and weakness. Diagnosis involves physical examinations, biopsies, and imaging procedures. The most common treatment is chemotherapy, which slows the growth of cancer cells. The prognosis depends on the type of lymphoma and the response to therapy; many dogs can achieve longer quality of life through treatment. Prevention is difficult, but a healthy lifestyle and protection from environmental toxins can reduce the risk. Research is focusing on genetic predispositions, improved diagnostic methods, and new therapeutic approaches to increase survival rates and quality of life for affected dogs.
Ursachen
The lymphatic system is an integral part of the immune system, consisting of a network of lymph vessels, lymph nodes, and lymphatic organs such as the spleen and tonsils. It plays a crucial role in fighting infections and removing waste products from the body. Lymphocytes, a type of white blood cell, are the key players in this system.
Lymphomas develop when lymphocytes proliferate uncontrollably. These malignant cells can accumulate in the lymph nodes and form Tumors, or migrate to other parts of the body. The exact cause of this uncontrolled cell division is often unknown, but genetic factors, environmental factors, and viral infections are considered possible triggers.
Genetic predisposition plays a significant role in certain dog breeds, as some breeds such as Golden Retrievers, Boxers, and German Shepherds have a higher susceptibility to lymphomas. Environmental factors such as exposure to certain chemicals or pesticides can also increase the risk. There is also evidence that infections with certain viruses may increase the risk of developing lymphomas.
Symptoms
The symptoms of lymphoma can vary depending on the affected organ and the course of the disease. A common sign is painless swelling of the lymph nodes, especially in the neck, groin, or behind the knees. These swellings are often the first sign that alerts the owner.
Other symptoms may include general weakness, loss of appetite, Weight loss, and increased Lethargy. If internal organs such as the spleen or liver are affected, dogs may show signs of Abdominal pain, Vomiting, or Diarrhea. If the bone marrow is involved, anemia or other blood count changes may occur, which can lead to pale mucous membranes, increased susceptibility to infections, or Bleeding.
In advanced stages of the disease, Respiratory distress may occur if the lymph nodes in the chest area are enlarged and pressing on the trachea or lungs.
Diagnose
The diagnosis of lymphoma usually begins with a thorough physical examination, during which the veterinarian examines the lymph nodes for Swelling. However, a definitive diagnosis usually requires further testing.
Fine-needle aspiration or biopsy of the enlarged lymph nodes is often performed to obtain cells for microscopic examination. These samples allow a pathologist to confirm the presence of malignant lymphocytes.
Additional tests may include blood tests to assess the dog’s overall health and detect possible changes in blood formation. Imaging procedures such as X-rays or ultrasound can be used to assess the spread of the disease to other organs. In some cases, a bone marrow biopsy may also be necessary to check for bone marrow involvement.
Therapie
Treatment for lymphoma in dogs can vary depending on the type and stage of the disease, as well as the dog’s overall health. The most common form of therapy is chemotherapy, which aims to destroy cancer cells or slow their growth.
Various chemotherapy protocols can be used, with the CHOP protocol (cyclophosphamide, doxorubicin, vincristine, and prednisone) being one of the most commonly used. This treatment can last for several months and requires regular check-ups. Side effects such as Vomiting, Diarrhea, or a temporary weakening of the immune system can occur, but they are usually well controlled.
In some cases, radiation therapy may be considered, especially when only a limited area is affected. Surgical removal of Tumors is less common, as lymphomas are often systemic and not confined to a specific area.
Prognose und Nachsorge
The prognosis for dogs with lymphoma depends on various factors, including the type of lymphoma, the stage of the disease at diagnosis, and the dog’s response to therapy. In general, many dogs with lymphoma who are appropriately treated can experience a significant extension of life expectancy and an improvement in their quality of life.
With chemotherapy, remission can be achieved in many cases, meaning that the disease is temporarily under control and no clinical signs are present. The duration of remission can vary greatly, with some dogs remaining in remission for several months to several years.
Unfortunately, lymphoma is still considered incurable in most cases, and the disease may eventually return. Life extension and quality of life depend heavily on aggressive treatment and the individual dog’s response.
Prävention
Since the exact causes of lymphomas are often unclear, there are no specific prevention measures that guarantee a dog will not develop lymphoma. However, some general measures can be taken to minimize the risk.
A healthy lifestyle, including a balanced diet and regular exercise, can strengthen the immune system and contribute to overall health. Minimizing exposure to environmental toxins, such as pesticides and tobacco smoke, can also be helpful.
Regular veterinary examinations are crucial to detect early signs of disease and enable timely treatment. For owners of breeds that are genetically more susceptible to lymphomas, it is especially important to be vigilant for possible symptoms and seek veterinary advice immediately if changes are noticed.
Ausblick auf aktuelle Forschung
Research on lymphomas and lymphosarcomas in dogs is constantly evolving, as these forms of cancer are among the most common malignant diseases in dogs. Scientists are focusing on better understanding the causes and mechanisms of the disease to develop more effective treatments and possibly preventive measures. A significant area of research is genetic predisposition. Researchers are investigating which genetic factors make certain dog breeds more susceptible to lymphomas in order to develop targeted breeding strategies that could reduce the risk.
Another focus is on improving diagnostics. The development of advanced imaging techniques and molecular tests could enable veterinarians to detect lymphomas earlier and more precisely. This is crucial, as early diagnosis is often associated with a better prognosis. Some studies are investigating the use of liquid biopsies, which search for circulating tumor cells in the blood to enable non-invasive diagnosis.
There are also exciting advances in therapy. Research is focusing on personalized medicine approaches, where treatment is tailored to the specific genetic makeup of a dog’s tumor. The goal is to develop therapies that target cancer cells while sparing healthy cells. This could lead to better tolerability and effectiveness of treatment. Immunotherapies that stimulate the dog’s immune system to fight cancer cells are also being intensively researched.
Another area where promising results are being achieved is the development of new chemotherapy drugs and the optimization of existing protocols. Researchers are testing combinations of medications to prevent resistance and increase effectiveness. Alternative therapies such as herbal remedies and nutritional approaches are also being studied to provide supportive treatment options.
Additionally, the quality of life of dogs during treatment is increasingly becoming a focus. Studies are analyzing how side effects of therapy can be reduced and what measures contribute to improving the animals’ well-being. The role of palliative care is also being increasingly studied to ensure that dogs in advanced stages of disease can live as pain-free and comfortably as possible.
Overall, current research shows promising approaches to improving diagnosis, treatment, and ultimately prognosis in dogs with lymphomas. Interdisciplinary collaboration between geneticists, oncologists, veterinarians, and other professionals is crucial to advancing progress in this field. It is generally expected that survival rates and quality of life for dogs with lymphomas will improve significantly in the near future through these efforts.
Frequently Asked Questions (FAQs)
1. What is a lymphoma in dogs?
2. What symptoms do dogs with lymphomas show?
3. How is lymphoma diagnosed in dogs?
4. Can lymphomas in dogs be cured?
5. What treatment options are available for lymphomas in dogs?
6. How long can dogs live with lymphoma?
7. Are there risk factors for lymphomas in dogs?
8. Can diet influence the risk of lymphomas in dogs?
9. Are lymphomas in dogs painful?
10. Can a dog with lymphoma live normally?
Literatur
- Childress, M. O., Avery, A., Behling-Kelly, E., Bennett, P., Brockley, L., Dickinson, R., Hughes, K., Kisseberth, W. C., Marconato, L., Martini, V., McCleary-Wheeler, A., Minoli, L., Rowland, P., Sills, S., & Aresu, L. (2025). Diagnosis and classification of primary nodal lymphomas in dogs: A consensus of the Oncology-Pathology Working Group. Veterinary and Comparative Oncology, 23(3), 331–345. https://doi.org/10.1111/vco.13064
- Rocha, M. C. P., Araújo, D., Carvalho, F., Vale, N., Pazzini, J. M., Feliciano, M. A. R., De Nardi, A. B., & Amorim, I. (2025). Canine multicentric lymphoma: Diagnostic, treatment, and prognostic insights. Animals, 15(3), Article 391. https://doi.org/10.3390/ani15030391
- Bennett, P., Williamson, P., & Taylor, R. (2023). Review of canine lymphoma treated with chemotherapy: Outcomes and prognostic factors. Veterinary Sciences, 10(5), Article 342. https://doi.org/10.3390/vetsci10050342
- Valli, V. E., Myint, M., Barthel, A., Bienzle, D., Caswell, J., Colbatzky, F., Durham, A., Ehrhart, E. J., Johnson, Y., Jones, C., Kiupel, M., Labelle, P., Lester, S., Miller, M., Moore, P., Moroff, S., Roccabianca, P., Ramos-Vara, J., Ross, A., … Vernau, W. (2011). Classification of canine malignant lymphomas according to the World Health Organization criteria. Veterinary Pathology, 48(1), 198–211. https://doi.org/10.1177/0300985810379428
- Hawkes, C., Morris, J., Bavcar, S., Wilkie, C., Ray, S., Auquier, C., Benjamin, S., Massó, J. B., Bottin, S., Davies, O., Desmas-Bazelle, I., Einhorn, A., Figueroa-Gonzalez, C., Holenova, K., Kritsotalaki, E., Peak, K., Smallwood, K., Treggiari, E., Valenti, P., … Fournier, Q. (2024). Comparison of CHOP-19 and CHOP-25 for treatment of peripheral nodal B-cell lymphoma in dogs: A European multicenter retrospective cohort study. Journal of Veterinary Internal Medicine, 38(6), 3193–3205. https://doi.org/10.1111/jvim.17222
- Siewert, J. M., Gustafson, D. L., Weishaar, K. M., Galloway, A. M., & Thamm, D. H. (2023). Individualized chemotherapy drug dose escalation in dogs with multicentric lymphoma. Journal of Veterinary Internal Medicine, 37(6), 2402–2409. https://doi.org/10.1111/jvim.16875
- Yale, A. D., Crawford, A. L., Gramer, I., Guillén, A., Desmas, I., & Holmes, E. J. (2024). Large granular lymphocyte lymphoma in 65 dogs (2005–2023). Veterinary and Comparative Oncology, 22(1), 115–124. https://doi.org/10.1111/vco.12959