Veterinarian technician Tracey Hennings sits with Blitz, a canine cop, after surgery to wait for her anesthesia to wear off in Rock Springs, Wyo., on Wednesday, Sept. 26, 2012. Blitz underwent stem cell therapy _ the first canine cop to do so in Wyoming _ because of persistent pain resulting from a torn cruciate ligament in her knee. (AP Photo/Casper Star-Tribune, Dan Cepeda)
