A 13-year-old, male Shih tzu dog presented with multiple demarcated papules and nodules around the light axilla. Histopathological examination revealed neoplastic proliferation of atypical cells with sebaceous differentiation, which showed invasion into the subcutis and lymphatics. These findings were consistent with sebaceous carcinoma, and pulmonary metastasis was indicated by chest X-ray examination. The dog died 2 months later, and an autopsy confirmed pulmonary metastasis of sebaceous carcinoma.

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Multiple subcutaneous nodules were identified on dorsal skin of 10-year-old neutered Australian Terrier under the treatment of pancreatitis. Sizes of nodule were variant. Some nodules became draining tract and oily hemoid pus was discharged from there. These nodules were diagnosed as sterile nodular panniculitis by histopathology and various culture tests. We thought pancreatitis as a cause of panniculitis in this dog from blood chemistry, abdominal ultrasound examination and clinical course.

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A 10-year-old, male Shih tzu presented with erythema, erosion, ulcer, crust on the abdomen, axillae, dorsal neck, scrotum, lips, and tongue. Histopathologic examination revealed thick epidermal coagulation necrosis and liquefaction at the hair follicles. All skin lesions of this dog were improved 45 days later without any specific treatments. This dog showed the classic clinical course of Erythema Multiforme Minor, although skin lesions were histologically compatible with those of Toxic Epidermal Necrolysis.

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A three-year-old, female American shorthair cat presented with a 2-year history of a gradually enlarged, isolated cyst at the right lateral neck. Hairs and scales were found within the cyst, and histopathologic findings were compatible with dermoid cyst. The previous 2 cases reported as dermoid cyst could be dermoid sinus. Thus, this seems to be the first report of true dermoid cyst in cats.

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