(Portland, OR)  --  TriMet says it's conducting an internal investigation after a MAX train ran off with a handicapped man's two dogs.  "KATU-TV" reports surveillance video shows the man, who has an amputated leg, hopping alongside the train Saturday evening when it left with his two service dogs on board.  The doors of the train closed before the man was able to get on.  The man and his dogs were reunited a short time after the incident.