Lymphoma in Dogs: Signs, Treatment and Life Expectancy

Types of Lymphoma in Dogs

• Multicentric: the most common form, affecting the lymph nodes and sometimes the spleen, liver and bone marrow.^4,2
• Alimentary (gastrointestinal): fewer than 10% of cases, causing vomiting, diarrhea and weight loss.^4,9
• Mediastinal: in the chest, which can cause coughing and breathing trouble, and is often linked with high blood calcium.^6,2,9
• Cutaneous (skin) and other rare forms.^6,2

Lymphoma is also classed as B-cell or T-cell. B-cell lymphoma is more common (about 60% to 80% of cases) and usually responds better to treatment.^9,6 Lymphoma is also graded as high-grade (fast-growing, the most common) or low-grade (slow-growing, up to 30% of cases). Dogs with low-grade lymphoma can live more than 2 years with treatment.⁴

Signs of Lymphoma in Dogs

• Firm, painless, swollen lymph nodes, sometimes 3 to 10 times their normal size^4,6
• Tiredness, weight loss and poor appetite^2,6
• Increased thirst and urination, from high blood calcium in 10% to 40% of dogs⁶
• Vomiting and diarrhea (alimentary form)⁴
• Coughing or breathing difficulty (mediastinal form)⁶

Many dogs feel well at diagnosis; a vet may find enlarged nodes during a routine exam.²

Which Breeds Get Lymphoma?

Any dog can develop lymphoma, usually in middle or older age.^2,3 Breeds at higher risk include Boxers, Golden Retrievers, Rottweilers, German Shepherds, Bullmastiffs, Basset Hounds, Saint Bernards, Scottish Terriers, Airedales and Bulldogs.^6,5,2,3 In one study of Golden Retrievers, lymphoma was diagnosed in almost 10% of males neutered before 12 months, three times the rate in intact males.¹⁰

Diagnosis and Staging

Lymphoma is usually diagnosed by a fine-needle aspirate of an enlarged lymph node, sometimes followed by a biopsy. Flow cytometry can show whether it is B-cell or T-cell, and a test called PARR can help confirm the diagnosis when results are unclear.^2,3,6 Staging with blood tests, X-rays, abdominal ultrasound and sometimes a bone marrow sample shows how far the disease has spread. Lymphoma is staged from I (a single lymph node) to V (bone marrow or blood involvement). Dogs that already feel unwell at diagnosis are classed as "substage b".⁶

Treatment Options

• Multidrug (CHOP-based) chemotherapy: the standard treatment, combining several drugs given weekly over several months. It gives the highest remission rates and the longest survival.^5,11
• Single-agent chemotherapy, such as doxorubicin alone: fewer visits and lower cost, with a median survival of about 6 to 8 months.¹¹
• FDA-approved lymphoma drugs: Tanovea (rabacfosadine) received full FDA approval in 2021, and Laverdia (verdinexor), an oral tablet, received full approval in January 2026.^7,12
• Prednisone (a steroid) alone: can make a dog feel better for a while, typically 1 to 2 months, but it doesn't treat the cancer long-term, and giving it before chemotherapy can make later chemotherapy less effective, so ask your vet before starting steroids if chemotherapy is an option.^11,13
• Palliative care: prednisone can give temporary relief, along with comfort care.²

Veterinary oncologists use lower doses than in human medicine, so most dogs keep a good quality of life.¹⁴ Side effects such as mild vomiting, diarrhea or tiredness are usually short-lived.^14,15 Most dogs don't lose much hair, though some breeds, such as poodles, can have thinning that usually regrows.^5,14 A veterinary oncologist can explain the options and costs.

Life Expectancy

• Untreated: most dogs live about 4 to 6 weeks, or about 2 months by some estimates.^11,2,3
• Prednisone only: remission typically lasts 1 to 2 months.¹¹
• Single-agent chemotherapy: about 6 to 8 months.¹¹
• Multidrug chemotherapy: a median of about 12 months for B-cell lymphoma and 6 to 8 months for T-cell lymphoma.^6,5 Dogs with low-grade lymphoma can live more than 2 years.⁴

In most dogs, lymphoma eventually comes back after remission.^11,5 Many can then be treated with a "rescue" protocol, but second remissions are usually shorter.^5,9

End-Stage Lymphoma and Saying Goodbye

As lymphoma progresses, dogs may show general illness such as low energy, weakness, fever, loss of appetite and dehydration.⁴ Your vet can help keep your dog comfortable. A quality-of-life scale that scores pain, appetite, hydration, hygiene, happiness, mobility and good versus bad days can help you decide when it's time; when bad days outnumber good ones, a peaceful euthanasia is a kind choice.¹⁶ See also cancer in dogs.

Frequently Asked Questions

What are the first signs of lymphoma in dogs?

Swollen, painless lymph nodes, often in the neck or behind the knees. Some dogs also drink more, eat less or seem tired.

How long can a dog live with lymphoma?

About 4 to 6 weeks untreated, and a median of about a year with multidrug chemotherapy for B-cell lymphoma.

Can a dog survive lymphoma without chemo?

Not long-term. Without treatment, most dogs live a few weeks to about 2 months. Steroids alone may help for a short time.

Are dogs in pain with lymphoma?

Swollen lymph nodes usually aren't painful, but dogs can feel unwell as the disease advances. Your vet can manage discomfort.

Is chemo worth it for a dog with lymphoma?

For many dogs, yes. Most go into remission with few side effects, and in one small survey most owners said they had no regrets.

What dog breeds are prone to lymphoma?

Boxers, Golden Retrievers, Rottweilers, German Shepherds and Bullmastiffs, among others.

Can lymphoma in dogs be cured?

Rarely. But it is very treatable, and many dogs live a good-quality life for a year or more.