Hemangiosarcoma of the nictitating membrane of two Great Dane dogs is reported. Treatment was successfully carried out by amputation of the nictitan. No recurrence of the mass or pulmonary metastasis was evident within a period of twelve months after the treatment. 1 Department of Surgery, 2Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand...