What is Cancer in Dogs?

Osteosarcoma is a type of cancer that typically arises in the bones of the limbs, or the appendicular skeleton. Less commonly, it may occur in the bones of the spine, pelvis, and skull – the axial skeleton....

Lymphosarcoma (lymphoma) is a malignant cancer that involves the lymphoid system of dogs. In a healthy dog, the lymphoid system is an important part of the body’s immune system defense against infectious...

Hemangiosarcoma is a malignant cancer of the cells that form blood vessels, and when these tumors rupture, serious internal bleeding can occur. Hemangiosarcoma is considered to be a very aggressive tumor...

Mammary gland tumors are a type of cancer that arise from breast tissue and are similar to breast cancer in women. About half of these tumors are malignant, which means they can spread, and half are benign...

Mast cell tumors, also called mastocytomas, arise most commonly in the skin and develop from a normal component of body tissues called mast cells that play a role in the process of tissue repair by releasing...

Hemangiosarcoma is a type of cancer that arises from blood vessels and can occur almost anywhere in the body. Usually when it occurs in bone it is due to metastasis from another site, although rarely,...

Urinary bladder tumors are rare in dogs, but of the possible cancers, transitional cell carcinoma is the most commonly diagnosed. This is a malignant cancer usually arising from the inside surface of the...