56 dogs that had undergone surgical excision of skin lesion tumors at Veterinary Medical Teaching Hospital in Seoul National University from 2000 to 2005 were evaluated retrospectively. The ratio of cases with benign versus malignant tumor types were 1.5:1.48 cases received surgical excision alone and 8 cases received adjuvant treatments. 42 cases were followed postoperative recurrence time and survival time (25 benign, 17 malignant). 25 cases (25/42, 60%) had no recurrence after surgical excision. In malignant tumor types, 5 cases (5/17, 29%) had recurrence and the median recurrence time was 157 days, and 8 cases (8/17, 47%) died due to tumors and survival time was 125 days. In benign tumor types, only 2 cases (2/25, 8%) had recurrence and the median recurrence time was 273 days.