Bone Cancer (Osteosarcoma) in Dogs

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Osteosarcoma in Dogs

Osteosarcoma refers to the most common bone tumor found in dogs. Bone cancer can affect any breed of dog, but it is more commonly found in the larger breeds.

The disease is extremely aggressive and has a tendency to spread rapidly into other parts of the dog's body (metastasize). There are treatment options available, but generally the long term prognosis for the animal is poor.

Bone cancer can be found in cats as well, but it is rare. If you would like to learn more about how this disease affects cats, please visit this page in the PetMD health library.

Symptoms and Types

Many signs of bone cancer are subtle. They can include swelling, lameness, and joint or bone pain. In some cases, dogs suffering from bone cancer will appear tired or have anorexia. Occasionally, dogs will exhibit a mass growth on their body or a painful inflammation around the site of the tumor.


Current knowledge of the disease has not linked genetics or gender to the condition, but bone cancer does appear more often in large to giant breeds of dogs. Some studies have shown a slight increase in the development of osteosarcoma among dogs that have experienced a blunt bone injury.


Your veterinarian will use X-rays to view the mass, often using several angles to get an accurate picture. Other tests include biopsies, blood tests, bone scans, and CAT scans to view the bone areas, and the mass, if discovered. If the diagnosis is bone cancer, it is important to note that the prognosis is often unfavorable and that there are numerous side effects to the treatment options. Management on your part will be required.

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The prediction of a disease’s outcome in advance


The disappearance of the signs and symptoms of a particular disease; this is often used in association with cancer


A neoplasm made up of bone, malignant in nature

lymph nodes

Small structures that filter out the lymph and store lymphocytes


Any type of pain or tenderness or lack of soundness in the feet or legs of animals


The study of the laws of inheritance n living things; may also be referred to as breeding


The occurrence or invasion of pathogens away from the point where they originally occurred

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