A11 year old intact male dog was brought to Madras Veterinary College Teaching Hospital with a history of a mass extending from the scapula to the caudal elbow region. On clinical examination, the mass was ulcerated, non-pedunculated and painful. Haemato-biochemical analysis was done, which revealed thrombocytopenia, neutrophilia (shift to left), monocytosis and a marginal increase in ALP levels. Thoracic and abdominal radiograph taken to rule out metastasis. Fine needle aspiration cytology revealed mast cell tumour. After the animal was stabilised with haematinics, antihistaminic and antibiotics, wide margination and excision of tumour was planned. As the defect after excision was extensive to be opposed through standard suturing technique, a thoraco dorsal flap was planned and performed. A penrose drain tube placed and sutured insitu. The drain tube was removed on 3rd post-operative day. Subjective evaluation of the skin flap was done 0, 3rd, 7th day post-operatively which reveals no abnormality. Complete skin flap uptake was observed without any complications and recurrence of tumour. The patient had an uneventful recovery.
