Lymphosarcoma, also known as lymphoma, is a cancer of the lymphocytes. Lymphocytes are specialized cells that function in the immune system. Lymphocytes are circulated throughout the body in a clear fluid known as lymph, and they are also found in the lymph nodes which are small organs that act as filters for the lymph system. Lymphosarcoma is categorized from stage 1 to stage 5 depending upon the number and location of lymph nodes or organs systems affected.

As with most cancers, early detection and treatment allows for the best prognosis.

Generally, the first sign of lymphosarcoma is an enlargement of the lymph nodes. These enlarged nodes will appear as lumps under your dog's skin. Other symptoms are dependent upon the location of the tumors and the organs impacted. However, general symptoms often include weight loss, diarrhea, lack of energy and difficulty breathing.

The exact cause of lymphosarcoma is unknown. However, evidence suggests that the following may be causes or contributing factors: hereditary predisposition and environmental factors such as sun exposure, pesticides, strong magnetic fields, pollution and other toxins.

A physical examination along with blood work and X-rays is required to diagnose lymphosarcoma and to identify the location of tumors. A biopsy or fine needle aspiration will confirm the diagnosis.

The cancer may be surgically removed if it is limited to one node or a few nodes in a localized area. However, chemotherapy is the main treatment for lymphosarcoma. As with most cancers, early detection and treatment allow for the best prognosis.

There is no complete prevention for lymphosarcoma. However, since it may be caused by hereditary factors or exposure to certain environmental elements, getting a dog who does not a family history of lymphosarcoma and preventing your dog from coming into contact possible environmental triggers may help prevent lymphosarcoma.

No, you cannot contract lymphosarcoma from your dog.