Diphallia or penile duplication is a rare congenital abnormality thought to result from duplication of the cloacal membrane in the early developmental stages in the uterus. The present case concerned a 4-year old intact male German shepherd dog. The patient presented with a complaint of paraphimosis. Clinical, laboratory, radiological and ultrasonographic examinations were carried out. Semen samples collected prior to surgery were examined. Following amputation, the penis with paraphimosis was sent for histopathological investigation. Karyotype analysis of the patient was also performed. As well as the first report of this abnormality in Turkey, this case report represents the first report of this condition in a German shepherd dog.