This study was carried out to investigate the arterial vascularization of the thoracic aorta in Turkish she-epherd dog. As a material, fourteen adult dogs were used. It was detected that the thoracic aorla supplied the irachea and the part ol the esophagus in the thoracic cavity, as well as. the superior wall of Ihe thoracic cavity and dorsal-hall ol its lateral wall in Ihe caudal of the fourth rib, by injecting coloured-latex into the vessels.