This case report includes the findings of a Monocephalien Cephalothoracopagus case in a lamb carrying Border Disease (BD) virus, which causes offspring with congenital anomalies in small ruminant herds. The fetus, which was taken by caesarean section, was found to be dead, a skull with 8 legs, conjoined from the chest area, both female. In the necropsy examination, it was observed that the larynx, which was formed in pairs, ended bluntly, the trachea and esophagus were not formed, and each tooth with a cleft of the upper palate did not have a cornu uterus. Persistent animals need to be removed from the herd as a preventive measure against border disease virus, which causes anomaly lamb births in sheep. Since it is a rare phenomenon, in sheep it was concluded that it would be useful to publish it.