Vol. 11, Special Issue 12 (2022)

The present study was undertaken to investigate the occurrence, gross, histopathological subtypes and malignancy grades of mammary tumours among dogs of Thrissur district of Kerala. Out of the 25 cases taken for the study, 24 were malignant and only one was a benign tumour. Mean age of occurrence was 8.96 ± 0.56 years. Intact nulliparous females were found to be more susceptible and Dachshunds were seen affected more. Caudal abdominal glands were mostly affected. Mean tumour size was 10.74 ± 2.14 cm. Ductal carcinoma was the most frequent histopathological subtype and majority of the tumours were grade II, six were grade III and three were grade I. High grade tumours were relatively larger than low grade ones. The study also indicated that histopathological subtyping along with malignancy grading could be used as a valuable tool for prediction of prognosis and clinical outcome in canine mammary CMTs.