Osteosarcoma (Bone Cancer) in German Shepherds
Oncological condition — German Shepherd — Large breed
Moderate Risk
What is Osteosarcoma (Bone Cancer)?
Osteosarcoma is the most common primary bone tumor in dogs and occurs predominantly in large and giant breeds. It typically affects the limbs (appendicular osteosarcoma) and is highly aggressive, metastasizing to the lungs in the majority of cases. It is one of the most devastating diagnoses in large breed dogs.
Symptoms of Osteosarcoma (Bone Cancer)
- Gradual onset lameness in one leg, typically worsening over weeks
- Swelling or firm mass at the affected bone
- Pain — dog may cry out when area is touched
- Reduced activity and reluctance to bear weight
- Pathological fracture in advanced cases
How Is Osteosarcoma (Bone Cancer) Diagnosed?
X-rays show characteristic changes in the affected bone — lytic (destructive) lesions with a 'sunburst' pattern or 'Codman's triangle' of periosteal elevation. Biopsy confirms the diagnosis. CT or X-ray of the chest screens for visible lung metastases at diagnosis.
Treatment & Cost
Standard treatment is amputation of the affected limb followed by chemotherapy (carboplatin or cisplatin), which extends median survival from 4–6 months (amputation alone) to 10–12 months. Limb-sparing surgery is an option in select locations. Palliative radiation reduces pain for owners who choose not to amputate.
Most pet insurance plans cover osteosarcoma (bone cancer) treatment in full when the policy is active before diagnosis. Compare plans below.