A 13-year old female miniature Poodle was presented with ventro-abdominal skin purpura. All mammary glands were included, but right side mammary glands and left thoracic gland were mild while left abdominal and inguinal glands were moderately changed. Overlying skin of mammary glands was purple colored, thickened, and firm. Yellowish brown colored mammary discharge was noticed from every teats except cranial thoracic gland. On histologic finding, dermal lymphatic vessels were filled with tumor emboli that stained positively with cytokeratin. This case was diagnosed as inflammatory mammary carcinoma by clinical examination and histopathologic finding.