In this retrospective study, some epidemiologic aspects and histopathologic characteristics of 236 canine mammary tumours diagnosed at the Pathology Department, Faculty of Veterinary Medicine, University of Ankara, from 1973 to 1998 were evaluated. Forty-eight of 236 dogs with tumours (23.08%) were poodle, 40 (19.23%) were caniche, 30 (14.43%) were terrier, 27 (12.98%) were German shepherd, 15 (7.21%) were pinscher, 48 (23.08%) were 13 different breeds and the breeds of 28 (11.86%) were not known. Most of the animals (96%) were between 5 and 15 years of age. The malignancies obtained in poodle and caniche breeds were more frequent than in other breeds, whereas there was no difference in the distribution of tumour types among breeds. One hundred sixty eight cases of 236 were malignant (2 myxosarcoma, 2 fibrosarcoma, 2 fibroosteochondrosarcoma, 1 fibromyxosarcoma, 1 fibromyxomyosarcoma, 2 osteochondrosarcoma, 1 myxomyofibrosarcoma, 68 malignant mixed tumors, 89 carcinoma) and the remaining 68 cases were benign (7 multilobular hyperplasia and cystic proliferative changes, 6 adenoma, 7 pericanalicular fibroadenoma, 2 fibroma, 1 osteoma, 2 osteochondroma, 1 myxochondroma, 1 fibromyxochondroma, 1 fibroosteochondroma, 1 fibromyxochondroosteoma, 39 benign mixed tumours). The locations of tumours were reported in 86 cases as follows: 10 (11.6%) in thoracic glands, 27 (31.4%) in abdominal glands, 35 (40.7%) in inguinal glands and 14 (16.3%) in various mammary glands. In addition, it was observed that malignant tumours caused metastasis to visceral tissues (lung, liver, kidney, urinary bladder and ovarium) with regional lymph nodes.

In this retrospective study, some epidemiologic aspects and histopathologic characteristics of 236 canine mammary tumours diagnosed at the Pathology Department, Faculty of Veterinary Medicine, University of Ankara, from 1973 to 1998 were evaluated. Forty-eight of 236 dogs with tumours (23.08%) were poodle, 40 (19.23%) were caniche, 30 (14.43%) were terrier, 27 (12.98%) were German shepherd, 15 (7.21%) were pinscher, 48 (23.08%) were 13 different breeds and the breeds of 28 (11.86%) were not known. Most of the animals (96%) were between 5 and 15 years of age. The malignancies obtained in poodle and caniche breeds were more frequent than in other breeds, whereas there was no difference in the distribution of tumour types among breeds. One hundred sixty eight cases of 236 were malignant (2 myxosarcoma, 2 fibrosarcoma, 2 fibroosteochondrosarcoma, 1 fibromyxosarcoma, 1 fibromyxomyosarcoma, 2 osteochondrosarcoma, 1 myxomyofibrosarcoma, 68 malignant mixed tumors, 89 carcinoma) and the remaining 68 cases were benign (7 multilobular hyperplasia and cystic proliferative changes, 6 adenoma, 7 pericanalicular fibroadenoma, 2 fibroma, 1 osteoma, 2 osteochondroma, 1 myxochondroma, 1 fibromyxochondroma, 1 fibroosteochondroma, 1 fibromyxochondroosteoma, 39 benign mixed tumours). The locations of tumours were reported in 86 cases as follows: 10 (11.6%) in thoracic glands, 27 (31.4%) in abdominal glands, 35 (40.7%) in inguinal glands and 14 (16.3%) in various mammary glands. In addition, it was observed that malignant tumours caused metastasis to visceral tissues (lung, liver, kidney, urinary bladder and ovarium) with regional lymph nodes.