Alleged sexual violation of a human female by a Rottweiler dog

An unusual case involving the alleged sexual violation of a woman by three men and a Rottweiler dog is described. Forensic examination proved difficult and showed little of evidentiary value but did reveal the presence of dog hairs at the scene, and semen from one of the men on the victim's panties. All attempts to locate and identify dog semen were unsuccessful. It was not clear whether dog semen could not be located using available techniques for semen identification, or whether dog semen was, in fact, not present at all.