A Prineville Police officer had to shoot and kill a dog that attacked him while he was trying to arrest two drug suspects. It happened Thursday when Prineville Police and the Central Oregon Drug Enforcement Team attempted to stop a vehicle as part of a methamphetamine investigation.   Prineville Police Chief Eric Bush says they deal with aggressive dogs on a regular basis and it's very rare that it escalates to this point: “The dog left the vehicle and went after the officer. While the officer was struggling with the passenger who was resisting arrest at the time, and the dog died immediately. So this is very rare. And we work very hard to prevent these types of things and its very tragic that the owner put this dog in that position." He says its fairly common for drug dealers to train their dogs to attack people in order to protect their drugs. Whitney Nicole Marks, 19, and Rolland Wayne Halsey, 19, were arrested in the incident.