Blood test analysis, i.e. determination of the number of erythrocytes, leucocytes, thrombocytes and other blood elements is nowadays used quite frequently for diagnostic purposes. Hematological parameters and body mass are reliable indicators of the general condition of the organism, and serve as an indirect indicator of the environment of the living organism. Hematological parameters and body mass were examined in a total of 60 dogs of various breeds, including mixed breeds. The purebred dogs

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... ncluded 30 dogs while the mixed breed group included another 30 dogs from the territory of Tuzla Canton. The examined dogs differed in the manner of nutrition and their living environment, and therefore, the results show a variety of deviations that were considered later on and further analysed in order to determine their causes. All examinations were conducted, observed and processed in accordance with relevant ecological environmental factors in the period of autumn of 2016. The aim of this study was to determine the influence of environmental factors in the study period on the hematological parameters of both examined groups of dogs. After the analysis of the blood test with the use of the hemogram for owned dogs and asylum dogs, that have been treated and kept in various manners, and the statistical processing of data obtained, it was concluded that the dogs with increased number of eosionophils had a parasitic disease. A large number of owned dogs had parasitic diseases due to incorrect usage of antiparasitics and not so frequent visits to veterinarians. The dogs that were under constant medical supervision were completely healthy.