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This case report was prepared to give information about Linognathus setosus (von Olfers, 1816) detected on a 2-year-old male Rottweiler breed dog which was brought to a private veterinary clinic due to restlessness and itching. Lice were found especially on the head, neck and back regions of the dog in the examination for ectoparasites. Four female, 2 male and 9 nymph lice were collected from dog. The collected lice were preserved in eppendorf tubes containing 70% ethanol (C 2 H 5 OH) and were sent to the Department of Parasitology, Faculty of Veterinary Medicine Selçuk University for species identification. In the laboratory, the lice were left to be transparent in a 10% potassium hydroxide solution and passed through a series of alcohols (70% - 99% ethanol), glued onto the slide with Canadian balsam and examined microscopically. Lice were identified as L. setosus . Although this species has been reported in Turkey, there is no article about its morphological structure, biology and prevalence. Therefore, detailed informations about the morphological features of L. setosus are given to inform veterinarians and scientists working in this field.