The majority of nasal tumors in the dog and cat are malignant. Adenocarcinoma, squamous cell carcinoma, and undefferentiated carcinoma are common nasal tumors in dogs. Lymphoma and adenocarcinoma are common in cats. Fibrosarcomas and other sarcomas also occur in both species. Bening tumors can include adenomas, fibromas, papillomas, and transmissible venereal tumors (the latter only [...]