In this case report, a case of nasal fibrosarcoma and hepatoid gland adenoma in the neck region in a dog is discussed. The nasal fibrosarcoma mass was approximately 6×9 cm in size, while the hepatoid gland adenoma was 2×3 cm in size. It was learned that the hepatoid gland adenoma in the cidago region had been the same size for about eight years and did not cause any clinical symptoms. It was determined that nasal fibrosarcoma on the left side of the nose caused clinical symptoms including respiratory depression, excessive tear discharge, and inability to open the eyelids. It was determined that hepatoid gland adenoma did not recur from two totally extirpated masses, but nasal fibrosarcoma recurred. Due to the exacerbation of the clinical findings and the decrease in the chance of treatment, it was decided to euthanize the dog with the consent of the owner.