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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.
It may also occur on the floor of the mouth, cheek lining, gingiva (gums), lips, or palate (roof of the mouth). Most oral cancers look very similar under the microscope and are called squamous cell carcinoma, but less commonly other types of oral cancer occur, such as Kaposi's sarcoma. In 2013 oral cancer resulted in 135,000 deaths up from 84,000 deaths in 1990. Five-year survival rates in the United States are 63%.