In December 2014, Kollin Bailey was running in a park near his home when he fell ten feet down a manhole. The six-year-old boy was trapped, and nobody could hear his screams for help. When he didn't return home, his parents called the police. Within minutes, the K-9 cops were on the scene. Sergeant Shane Matheson let his partner, a bloodhound named Copper, sniff items owned by Kollin. The dog quickly learned the boy's scent and went to work searching--...