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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.
The graver the tumor is, the higher the grade will be. 1  Grade I â Most cases of mast cell tumors in dogs belong here. 2  Grade 2 â The tumor grew from the subcutaneous tissues and the skin. 3  Grade 3 â This is the least common type.