This research enlightens on leptospira serovars and its pathogenicity pattern in canines.It covers the spatial Epidemiology of Leptospirosis in Tamilnadu. It records the emerging serovars and its importance in the disease control strategy.This work also emphasis on hemo gram and biochemical markers as a tool to judge the cases.This work finds the possibilities of zoonotic pathway and also correlates the pet owners responsibilities.