Osteosarcoma
radiation therapy
for pets in Florida.
Osteosarcoma is the most common primary bone tumor in dogs. When surgery is not an option — or quality of life is the priority — radiation therapy can deliver meaningful pain relief and better quality of life without amputation.
Osteosarcoma: the most common bone tumor in pets — and radiation helps.
Osteosarcoma (OSA) accounts for over 85% of primary bone tumors in dogs. It is painful, locally destructive, and fast-moving. Radiation therapy — palliative or curative-intent — offers real, measurable improvement in pain and quality of life when surgery is not the right path.
In dogs, osteosarcoma most commonly affects the long bones — distal radius, proximal humerus, distal femur, and proximal tibia — particularly in large and giant breeds. The tumor destroys bone from within, causing escalating pain as the cortex weakens. Osteosarcoma also occurs in cats, where appendicular OSA tends to carry a better prognosis than in dogs. Axial osteosarcoma — affecting the skull, spine, ribs, or pelvis — presents unique challenges in both species.
Osteosarcoma treatment without amputation
Amputation with chemotherapy remains the standard of care for appendicular osteosarcoma in dogs when feasible, offering median survival of 10–12 months. But not every pet is a surgical candidate — due to age, concurrent orthopedic disease, body condition, or owner preference. For these cases, palliative radiation combined with analgesics and bisphosphonates is an effective non-surgical option for osteosarcoma pain management.
Palliative radiation for osteosarcoma reduces tumor-associated inflammation and slows local bone destruction — the primary drivers of pain. Most dogs show meaningful pain relief, often within the first few sessions. This is not curative, but the improvement in comfort and mobility is clinically significant and well-documented.
Axial osteosarcoma — when radiation therapy is the primary treatment
For osteosarcoma of the skull, spine, ribs, or pelvis, surgery is rarely feasible. Radiation — both palliative and sometimes curative-intent radiation therapy — becomes the primary treatment modality. Axial osteosarcoma cases at AARADONC are evaluated individually, with protocol selection based on tumor location, extent, and patient status.
Scientific references.
The clinical information on this page is grounded in peer-reviewed veterinary radiation oncology literature.
- Coomer AR, et al. (2009). Radiation therapy for canine appendicular osteosarcoma. Vet Comp Oncol.
- Martin TW, Griffin L, Custis J, et al. (2021). Outcome and prognosis for canine appendicular osteosarcoma treated with stereotactic body radiation therapy in 123 dogs. Vet Comp Oncol.
- Ramirez O III, Dodge RK, Page RL, et al. (1999). Palliative radiotherapy of appendicular osteosarcoma in 95 dogs. Vet Radiol Ultrasound. 40(5):517.
- Duffy ME, Anderson CL, Choy K, Fidel JL (2018). Metronomic administration of lomustine following palliative radiation therapy for appendicular osteosarcoma in dogs. Can Vet J. 59:136.
- Swift KE, LaRue SM (2017). Outcome of 9 dogs treated with stereotactic radiation therapy for primary or metastatic vertebral osteosarcoma. Vet Comp Oncol.
with osteosarcoma pain.
Palliative radiation for osteosarcoma can make a real difference in your dog's or cat's comfort and mobility. Request a consultation and Dr. DiBernardi will review the case personally.
Request a Consultation →case today.
We acknowledge all referrals promptly and coordinate directly with your existing pain management protocol.
Submit a Referral →