Canine mammary tumours: A study on occurrence and distribution pattern

The objective of the study was to record the occurrence of spontaneous canine mammary tumours and their season, breed and age- wise distribution. A total of 99 cases of mammary tumours (24.32%) out of 407 dogs presented at polyclinics during the period from February 2003 to November 2007, were recorded and confirmed histopathologically. The highest cases were recorded in the month of September (27.00%), with German Shephered breed being the most susceptible (29.30%) followed by Spitz (20.20%). Majority of the tumour cases were recorded in the age group of 4 to 10 years. Histologically, benign tumours in 64.65 % and malignant types in 35.35% cases were recorded. The vulnerable age group (4–10Years) indicated role of reproductive hormones as predisposing factors in the development of tumours.