Lymphoma in dogs: what you need to know as an owner

Lymphoma is one of the most common forms of cancer in dogs. Yet, many owners barely know what it entails until a diagnosis is made. In this article, we explain exactly what lymphoma is, how you can recognize it, which treatments are available, and how you can best support your dog at home.

What is lymphoma in dogs?

Lymphoma (or lymphosarcoma) is a malignant disease of the lymphatic system—the network of lymph nodes, lymph vessels, and lymphoid tissue that plays a central role in the immune system. With lymphoma, malignant lymphocytes (a type of white blood cell) grow uncontrollably.

Dogs can develop several forms of lymphoma. The most common is multicentric lymphoma, where multiple lymph nodes are affected simultaneously. Other forms affect the intestines, skin, chest, or individual organs.

Which dogs are more likely to get lymphoma?

Lymphoma can occur in any dog, but certain breeds are more susceptible, including Golden Retrievers, Boxers, Bulldogs, Basset Hounds, and Airedales. Middle-aged to older dogs (5–9 years) are the most affected, although it can also occur in younger dogs.

Symptoms of lymphoma in dogs

The most striking first clue is often enlarged lymph nodes—felt as lumps under the jaw, in front of the shoulders, in the armpits, the groin, or behind the knees. The nodes feel firm but are usually not painful.

Further symptoms may include:

• Fatigue and less energy
• Decreased appetite and weight loss
• Increased thirst and urination (in certain forms)
• Swollen abdomen (in the intestinal form)
• Shortness of breath (in the chest form)
• Skin problems or itching (in the skin form)
• Gastrointestinal issues

Enlarged lymph nodes are not always cancer. Infections can also enlarge them. However, any persistent enlargement should be examined.

Diagnosis: how is lymphoma determined?

Your veterinarian will perform a combination of tests:

• Fine-needle aspiration (FNA): cells from the lymph node are examined microscopically—fast and minimally invasive
• Biopsy: tissue sample for more detailed information
• Blood tests and urinalysis: to assess general condition and organ function
• Imaging (ultrasound, X-rays): to potentially map the extent of the disease

Based on these results, the lymphoma is classified and staged (divided into stages I through V, depending on the extent).

Treatment of lymphoma in dogs

Chemotherapy: the standard treatment

Lymphoma in dogs typically responds well to chemotherapy. The most commonly used protocol is CHOP, a combination of multiple chemotherapy drugs administered over a period of 15–25 weeks. Most dogs achieve remission (symptoms temporarily disappear), but a cure is rarely the case.

The average survival time with CHOP chemotherapy is around 12–14 months, with some dogs surviving for 2 years or longer.

Simpler protocols

For owners who choose a less intensive path (fewer visits, lower costs), there are also simpler protocols based on a single chemotherapy drug, such as lomustine or doxorubicin. The chance of response is lower, but the quality of life can still remain good for a long time.

Prednisone only

Corticosteroids like prednisone can temporarily reduce lymph node size and improve appetite. They do not provide a cure, but can offer comfort in a palliative situation. Important: the use of prednisone before chemotherapy can reduce the subsequent response to chemo, so always discuss this with your veterinarian first.

Radiotherapy

Sometimes used for localized forms of lymphoma, but less common than with other types of cancer.

Life expectancy with lymphoma

This depends heavily on the type, stage, and chosen treatment:

• Without treatment: average 4–8 weeks after diagnosis
• With prednisone only: 2–4 months
• With chemotherapy (CHOP): average 12–14 months, sometimes longer

These figures are averages—individual dogs can vary significantly in both directions.

How to support your dog at home?

Nutrition plays a crucial role. Lymphoma is often accompanied by cachexia (muscle loss) and decreased appetite. Focus on:

• High-quality proteins to maintain muscle mass
• Omega-3 fatty acids to mitigate tumor-associated inflammation
• Small, frequent meals if the appetite is fluctuating
• Nutritious snacks to supplement intake on difficult days

BraveBites® were developed by veterinarians with exactly these needs in mind: high protein, enriched with omega-3, and tasty enough to entice dogs with a reduced appetite as well.

In addition to nutrition: rest, familiar routines, and your proximity are at least as valuable to a dog with lymphoma.

Do you have questions about nutritional support for lymphoma? Discover BraveBites →