11/07/2024
Signs of Lymphoma in Dogs🐾
Cancer that originates within the lymphatic system is called lymphoma or lymphosarcoma (LSA). It is the most common cancer seen in dogs, with 20 to 100 cases per 100,000 dogs. It also is treatable though typically not curable.
Early detection is important, because lymphoma in dogs can spread to bone marrow and internal organs. It can also spread to the skin and/or the lungs, although those instances are less common. Among the more visible signs to look for are enlarged lymph nodes, but they can swell from other causes, too, so a visit to the veterinarian is in order before any presumptions are made.
Many of the symptoms displayed if a dog has lymphoma can also be symptoms of other issues. For instance, unexplained weight loss, a decrease in appetite, increased drinking and urination, lethargy, and vomiting and/or diarrhea can all have multiple causes. Lymph nodes can swell for reasons other than lymphoma, such as from infections or tick disease. And a lump may even be a noncancerous fatty lipoma rather than a swollen lymph node.
As a caring pet parent, you can check your dog regularly for lumps or bumps, keeping notes about their size and location so that you’re aware of any growth or shape changes. Areas that you can check for small lumps that might be swollen lymph nodes include:
Under the jawbone
In the shoulders
Under the front legs
In the groin
Behind the knee region
Lymphoma in dogs also can result in an increased respiratory rate with more shallow breaths being taken. Some dogs with lymphoma may display a pot-bellied appearance. In the relatively few cases when lymphoma spreads to the skin it can present as reddened regions or ulcers or can appear as big, flaky white crusts. In the mouth, lesions resembling hyperemic (very red) gingivitis or periodontal disease may occur.
Since many of these clinical signs could represent a different issue, your pet should be examined by a veterinarian to determine the cause.
Workup, Diagnosis & Staging
To determine the cause of a dog’s symptoms, a veterinarian typically will perform a complete physical examination, including bloodwork and urinalysis. If lymphoma or any other type of cancer is suspected, additional procedures can include three-view chest X-rays and an abdominal ultrasound to determine whether there are tumors or whether the cancer has metastasized (spread). If enlarged lymph nodes or the presence of a mass in the chest are among the symptoms, a fine needle aspiration may be performed to draw a sample of the tissue for further testing. Occasionally, a biopsy may be needed. At times, specialized tests (flow cytometry, PARR test) may help further characterize this disease into B-cell lymphoma or T-cell lymphoma.
If lymphoma is diagnosed, it will be important to determine the stage to which the cancer has advanced. This information is critical for treatment planning.
Stage I: Cancer is detected in a single lymph node.
Stage II: Cancer is detected in multiple lymph nodes on the same side of the diaphram.
Stage III: Cancer is detected in multiple lymph nodes on both sides of the diaphram.
Stage IV: Cancer has spread to the liver and/or spleen.
Stage V: Cancer has spread to the bone marrow (and the blood) or the central nervous system.
The lymphatic system may not be the most well-known among body systems, but it’s one of the most important. Lymph nodes, lymphatic fluid and lymph vessels help filter fluids, fight infections and remove toxins, among many other functions critical to a dog’s immune system.
Causes of lymphoma in dogs can be multifactorial. Sometimes lymphoma can be genetic, other times environmental and still sometimes we do not know why a canine succumbs to this disease. Dogs stricken with lymphoma tend to be older, and certain breeds — including Golden Retrievers, Boxers, Scottish Terriers, Rottweilers and Bullmastiffs — seem to develop lymphoma more than others. A dog’s s*x does not appear to be a factor.
Treatment Options & Prognosis
Lymphoma in dogs should be considered a systemic cancer, and treatment options thus typically target the entire lymphatic system or even the entire body. This is in contrast to, for example, surgery to remove a tumor from a specific location. Still, there are a number of options that may put the cancer in remission and/or improve your dog’s quality of life and extend your time with him or her:
Chemotherapy
Chemotherapy is the prevailing treatment option for canine lymphoma. There are a number of chemotherapy protocols all varying based on the number of treatments needed, the type of lymphoma (small cell, large cell, etc) and a pet parent’s personal choice. Chemotherapy is typically is administered intravenously but on occasion can be given orally in the form of pills. About 85% of dogs will go into a remission with treatment. Most dogs tolerate chemotherapy well but about 15% of them will have side effects. These could include nausea, vomiting, diarrhea and/or a reduced appetite. Side effects usually begin within the first four days of treatment and can last for four days. Most dogs will not lose their fur, although breeds with fur that is more hair-like can (Poodles, Bichon Frises, Terriers, etc.). After undergoing chemotherapy, dogs often do well for six to 12 months, depending on the type of lymphoma and the chemotherapy protocol used. If the lymphoma is a small cell variant, which is less aggressive, a dog could do well for a year or two.
Conventional Radiation or Stereotactic Radiation
In instances of localized lymphoma where treatment can be focused on a specific area, such as with nasal lymphoma, radiation has been successfully used. There are two primary types. Conventionally fractionated radiation therapy (CFRT) typically consists of 16 to 18 treatments. A more innovative version, Stereotactic Radiation, is much more targeted form of radiation while greatly sparing the surrounding tissues. It usually requires just one to three treatments, sparing your dog several additional times of being subjPetCure Oncologysia.
The PetCure Oncology team is highly qualified to provide stereotactic radiation therapy. With either type of radiation, a dog may experience side effects similar to sunburn on their nose (or other treatment site). However, dogs do not experience the side effects seen with chemotherapy — although concurrent chemotherapy may be recommended depending on the stage of lymphoma.
Bone Marrow Transplant
Currently, only Bellingham Veterinary, in Bellingham, Washington has the needed expertise of performing transplants.
Drugs
If other treatment options are declined, a corticosteroid called prednisone can be used to help slow the progression of cancer. This may lead to your dog drinking more water, urinating more, being hungrier and having increased panting. Prednisone can help to kill some of the cancer cells, making the enlarged lymph nodes smaller. This drug typically helps for two to three months or so. In instances where it’s used as part of a chemotherapy protocol, it should not be started before chemotherapy.
Low-Dose Rate Half-Body Irradiation with Chemotherapy for Canine B-Cell Lymphoma
Recent advancements in the treatment of canine B-cell lymphoma have shown that combining low-dose rate half-body irradiation (LDRHBI) with CHOP chemotherapy significantly improves survival times compared to traditional chemotherapy alone. This combined protocol, which involves integrating radiation therapy early in the treatment process, has proven to be highly effective, particularly when offered at the time of diagnosis. Multiple studies indicate that this approach can extend remission periods and enhance the quality of life for dogs affected by B-cell lymphoma. Like any treatment, there are risks, specifically that toxicity can occur in about 5-10% of cases and can be life threatening. Early and strategic incorporation of this treatment can provide pet families with more informed options for managing their dog’s B-cell lymphoma diagnosis. Read the full article about this latest treatment option and discuss it with your veterinarian or reach out to our Pet Advocate Team. Our Pet Advocates Team is a highly trained, free resource that is available to answer any questions you may have about cancer in pets.
No treatment
Lymphoma is a progressive cancer. If all treatment options are declined, the disease can progress quickly.
Contact Information PetCure Oncology:
☎️ 833.975.3194
https://petcureoncology.com/locations/
Contact Information Bellingham Veterinary:
☎️ tel:+1360.734.0720
https://bhamvet.com
