SIERRA VISTA — Officers were forced to shoot and kill an aggressive dog in an apartment in Sierra Vista after it attacked its owner. The dog, thought to be a German Shepherd and Chow mix, bit its owner in her arm and head before police were contacted at 8:25 p.m. on Thursday and responded to Vista de la Sierra Apartments, 1555 Busby Drive, said Tracy Grady, public information officer for the Sierra Vista Police Department. “When the officers responded to the apartment, they found the victim still inside the apartment with the dog,” Grady said. The first officer on scene,...