Most blood parasitoses are transmitted by means of carriers - ticks or insects, which bodies undergo certain development stages or transmission is carried out mechanically. Dirofilariasis is a zoonotic disease of animals and humans carried by mosquitoes. The reasons for dirofilariasis spread are the unrestricted movement of animals from one region to another. To diagnose dirofilariasis, a microscopy method of a fresh blood drop was used. Diagnosis for babesiosis in animals was made based on clinical traits and results of microscopic examination of peripheral blood smears stained according to Romanovsky-Gimza. The study of the ixodic ticks’ prevalence as distribution sources of dog babesiosis was carried out in Barnaul in different parts of the city. The spring rise of babesiosis begins in late April and ends at the end of May, the summer period June-July is characterized by a low incidence rate. The autumn rise is from August to October, i.e., it coincides with ticks’ activity during this period. The incidence of ticks in Barnaul is not uniform. The largest range of ticks’ distribution is found in the highland part of the city.