Family members claim they called police for help Wednesday morning, but when officers arrived, they were treated like criminals and an officer shot and killed their family dog. It all unfolded in the 1100 block of Fiji Lane in Landover. Four-year-old Mercedes, a Rottweiler mix, is the latest dog shot and killed by police in Prince George's County. Dog owner Sterling Barlow said about Mercedes, "Cold blood... Shot in the head for no reason." The problem started when owner Sterling Barlow's brother pulled into the family driveway after work early Wednesday morning. The family claims two men immediately approached, armed...