When Army Specialist Tyler Roberts and his bomb-sniffing dog, Cpl. Donna, were in Afghanistan together, the two were inseparable.
"We were there for a year together, spent 24 hours a day together," Roberts told Denver's KUSA.
But when his tour was up, Roberts returned to the U.S., and had to say goodbye to his best friend. He believed that Donna, a 6-year-old Belgian Malinois, was being retrained and would serve another tour of duty with a different handler - but the truth was much more tragic.