Alternaria alternata is a fungus species which can infect animals and people as well as being commonly found in nature. On the other hand, animals with Alternaria infection can infect other animals and people by spreading a high amount of fungal spores. In this work, Alternaria alternata was detected for the first time in Turkey from the skin lesions of a dog, an antifungal susceptiblity testing was carried out and treatment with itracanozole to which the agent showed susceptibility was accomplished. The aim of this work was to report the Alternaria infection in dogs in Turkey for the first time, to draw attention to the zoonotic dimension of this disease and to emphasize the importance of antifungal susceptibility tests. © 2017, Chartered Inst. of Building Services Engineers. All rights reserved.