A hero's welcome for K-9 Ace. The 7-year-old German shepherd walks back into the Polk County Sheriff's Office on three legs, surrounded by the deputies he help

A hero's welcome for K-9 Ace. The 7-year-old German shepherd walks back into the Polk County Sheriff's Office on three legs, surrounded by the deputies he helped protect just days earlier. Ace was critically wounded after authorities say a suspect opened fire as deputies attempted an arrest. His h…