A St. Louis police officer was accidentally shot Thursday by his partner, who was trying to shoot what they said was an aggressive-looking dog. The two cops were investigating local copper thefts when they were approached by an "aggressive dog showing its teeth." One officer — the one who didn't end up with a bandage on his arm — pulled his gun and fired "three or four shots" at the animal. One bullet ricocheted off a sidewalk, bouncing backward and hitting his partner near his elbow. Neither officer knew if the dog had been wounded, since it quickly ran away. Although it's lucky that the officer wasn't seriously wounded, his partner might need to spend some time working on his aim.