This paper represents the first report on the presence of a cardiorespiratory nematodes in the gray
wolf from Bosnia and Herzegovina. The heart and lungs with corresponding trachea from wolves that were
legally hunted from 2009 to 2019 have been analysed by routine post mortem macroscopical examination. A
total of 25 heart samples were examined for the presence of Dirofilaria immitis and Angiostrongylus
vasorum, while five lungs with trachea samples were examined for the presence of lung nematodes. There
was no confirmed presence of Dirofilaria immitis and Angiostrongylus vasorum, while the presence of
species Eucoleus aerophilus was established in one case (20%). This study confirms that the gray wolf is a
source of infection with Eucoleus aerophilus to other natural hosts.
