Osteosarcoma
radiation therapy
for pets in Florida.
Osteosarcoma is the most aggressive bone tumor in dogs and cats. When surgery is not an option — or quality of life is the priority — radiation therapy delivers meaningful pain relief and extended survival 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 the most 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. Over 90% of treated pets show meaningful pain reduction, often within 24–72 hours of the first session. 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 CFRT — becomes the primary treatment modality. Axial osteosarcoma cases at AARADONC are evaluated individually, with protocol selection based on tumor location, extent, and patient status.
Osteosarcoma by location
in dogs and cats.
The location of osteosarcoma determines treatment options. Appendicular OSA (limb bones) and axial OSA (skull, spine, ribs, pelvis) require different radiation approaches. Dr. DiBernardi evaluates each case individually.
Pain relief first.
Quality of life always.
For most osteosarcoma cases, palliative radiation is the recommended protocol. Curative-intent CFRT may be indicated for select axial osteosarcoma in dogs and cats. Dr. DiBernardi reviews every case individually before recommending a plan.
Radiographic and CT imaging is used to assess osteosarcoma extent, cortical involvement, and pathologic fracture risk before treatment planning.
The most effective non-surgical option for osteosarcoma pain management. Reduces tumor-associated inflammation and bone destruction — over 90% of pets respond within days of the first session.
Definitive fractionated RT for axial osteosarcoma where surgery is not feasible. Aims for durable local control at anatomically challenging sites in dogs and cats.
Osteosarcoma treatment —
what pet owners ask us most.
with osteosarcoma pain.
Palliative radiation for osteosarcoma can make a real difference in your dog's or cat's comfort and mobility within days. Whether you've been referred by your veterinarian or are reaching out directly — request a consultation and Dr. DiBernardi will review the case personally.
Request a Consultation →case today.
Palliative RT for osteosarcoma is most effective when started before pain becomes severe. We acknowledge all referrals the same day and coordinate directly with your existing pain management protocol.
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