(Portland, OR)  --  Police are searching for a man accused of using a dog to try to lure two young girls into his car.  The Washington County Sheriff's office says the suspect stopped his Subaru Outback in front of the girls on Northwest Ash Street near Portland last night and blocked them from crossing the street.  He then allegedly rolled down his windows to reveal a medium-sized gray dog in the backseat and told the girls the dog was friendly and loved children.  Police say he fled the scene after one of the girls' parents showed up.  He's described as a white man in his 40s with gray or white hair and blue eyes.