Radiation therapy
for oral melanoma
in dogs — Florida.

Local control with radiation.
Systemic control with immunotherapy.

Oral melanoma grows quickly and metastasizes early — to regional lymph nodes and distant sites including the lungs. This is why local treatment alone is rarely enough. Radiation controls the primary tumor; immunotherapy addresses microscopic systemic disease. Together, this multimodal approach has produced the most meaningful survival improvements documented in veterinary oncology for this diagnosis.

Oral melanoma arises most commonly from the gingiva, hard palate, and labial mucosa. It grows rapidly and invades adjacent bone in most cases. The first warning signs — facial swelling, difficulty eating, halitosis, or bloody saliva — often appear when the tumor is already at a significant size. Rapid progression means that staging and treatment should begin as soon as the diagnosis is confirmed.

Why radiation therapy is highly effective for melanoma

Unlike some tumors that require daily low-dose fractionation to respond, melanoma is particularly sensitive to large-fraction hypofractionated radiation. This means meaningful local control can often be achieved in 4–6 sessions rather than 16–20 — fewer anesthetic events and a shorter treatment window, without compromising efficacy. Definitive CFRT is also an option and may be preferred in select cases.

What to expect from treatment

Radiation for oral melanoma is delivered under short general anesthesia and the dog goes home the same day. Most patients tolerate treatment well. Acute oral mucosal reactions are the most common side effect and are temporary. Tumor response — visible shrinkage and reduced discomfort — typically becomes apparent within weeks of completing the radiation course.