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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.
General Information About Oral Cavity and Oropharyngeal Cancer. Oral cavity cancer and oropharyngeal cancer are diseases in which malignant (cancer) cells form in the mouth or throat. Most oral cavity and oropharyngeal cancers start in squamous cells (thin, flat cells) that line the oral cavity and oropharynx.