More than 1200 biological samplings were collected from the free-ranging dogs of various ages and biotopes that allowed to study the diversity of their helminth fauna. The results of investigations revealed that 95% of researched dogs are infested with multiple parasites mostly endoparasites (Eimeria canis, Dipilidium caninum, Echinococcus granulosus, Toxocara canis, Toxascaris leonina, Ancylostoma caninum and Trichocephalus vulpis.). It was established that the level of contamination with the all above mentioned parasites in free-ranging dogs is hogher in the adult dogs compared to the young ones. The young dogs were predominantly infested with parasites from the class Sporozoite (Eimeria canis) and the Nematoda class (Toxocara leonina). The level of contamination with parasites of the free-rangeging dogs is higher in the rural regions compared to the urban area.