Canine babesiosis is increasing in incidence and prevalence and is now a major problem in dogs. During this study, a total of 6204 dogs were examined for babesiosis over a 12 month period from January to December, 2006 in Lahore and 2.62% were found positive. The dogs were grouped on the basis of their age, sex and breed and season of the year. The male dogs were more prone to disease than female dogs (3.39 vs. 1.32%), whereas the incidence of disease was higher in younger dogs (6.9%) than older age groups. Crossbreds were more prone to the infection (10.9%) than purebreds. However, none of them were completely resistant. Warm and humid season played a key role in the spread of disease. Predominant vector of the disease was found to be Rhipicephalus species.

Key words: Babesia, epidemiology, vector, dog.