A pair of threatening armed robbers in Los Angeles turned tail and fled when confronted by an angry ... Chihuahua. The pair ran off before getting all the cash they wanted after the 10-pound dog ferociously barked at them and jumped at one robber's leg, the Los Angeles Times reports. The Chihuahua, a rescue dog that likes to wander around area businesses, chased the men out of the smoke shop and down the street. (More chihuahua stories.)