Col. Kenneth Boone, 375th Dental Squadron endodontist, examines the tooth of Jack, a 375th Security Forces Squadron military working dog, prior to root canal surgery at the 375th Dental Squadron clinic April 21, 2011, at Scott Air Force Base, Ill. Jack, a bomb detection military working dog assigned to Scott AFB, broke his tooth during patrol training. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)