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Oral Cancer. Tumors of the mouth and throat (oropharyngeal tumors) are common in dogs and include malignant melanoma (the most common canine oral tumor), fibrosarcoma, squamous cell carcinoma and epulides.
Some of the tumors can also invade into the surrounding local tissues and contribute to secondary problems like swelling, pain, adjacent tooth death, extension into the nose or eye, or pathologic jaw fractures. Malignant melanoma(MM) is the most common malignant oral tumor seen in the dog. The tumor may appear as pigmented or non-pigmented.