In the midst of the raid targeting the leader of the Islamic State was this: at least one military working dog who chased Abu Bakr al-Baghdadi into a tunnel before he detonated a suicide vest and died. Intrigue about the dog began building after the president disclosed that Baghdadi died during a U.S. Special Operations raid and that the dog was injured. The raid was carried out by elite members of Delta Force and the Army's 75th Ranger Regiment, according to several U.S. officials with knowledge of the operation.