An eleven-year-old spayed American Akita bitch rapidly developed a mammary tumour which was surgically removed. The histological examination revealed the tumour to be a sarcoma that presented positive immunohistochemical staining against vimentin and protein S 100. There was no staining against pan-actin. Based on the histological aspect and the pattern of immunohistochemical staining the diagnosis of primary extraskeletal chondrosarcoma of the mammary gland was considered most probable. Two months later the patient was euthanized with recurrent local tumour and metastases in the lungs.
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