Evaluation of clinical and pathological characteristics of 155 canines with mammary tumours: a retrospective study

Abstract

In the present study, clinical and pathologic features of 155 bitches with mammary tumours were evaluated retrospectively. Fifty-five percent of the animals with mammary tumours were Poodles (83 patients). Mean age at the time of tumour excision was 10.3 +/- 0.2 years and days between the time the tumour was first determined and the time the dog was presented were 308 +/- 38.5 days. Fourty-six of the 119 dogs whelped at least once and 22 of 59 dogs had a history of false pregnancy. Two per cent of the animals also had tumors of vulvar and vaginal origine. Two-hundred and twelve tumours were surgically removed and out of the 212 tumours, 78.3% were malignant, 12.3% were benignn, 80% were hyperplastic changes and 1.4% were unclassified tumours. No significant association was found between the histopathological type of mammary tumours and age, breed, location and duration of the tumour, reproductive status, history of pergnancy or pseudopregnancy.