The ear is divided into three parts: the external ear, middle ear, and internal ear. The external ear is a funnel-shaped structure that channels air vibrations to the tympanic membrane. It consists of the auricle (pinna) and the external ear canal (external acoustic meatus) that extend to the tympanic membrane. The structure of external ear canal is both cartilaginous and osseous. Some hair and many tubular ceruminous and sebaceous glands are present in the canal. Their secretions forms cerumen, a mucilaginous fluid containing brown granules. Two surgical techniques are available for the treatment of neoplasms of the external canal: the lateral resection, for small neoplasm's nodules of the canal; and the ablation of the ear canal, operation of choice when the neoplastic mass is deep and extensive, within the ear canal. It describes the case of a male dog, Cocker Spaniel, ten years old, patient treated in Surgery, Faculty of Veterinary and animal Sciences, University of Chile, with an episode of external otitis and a tumor that involved the right ear pinna and external right ear canal. It was decided proceeded taking samples for biopsy and subsequently to perform the removal of the external ear canal. The histopathologic diagnosis was ceruminous gland cell carcinoma.