(Portland, OR)  --  Washington County sheriff's deputies are investigating an armed holdup at a business in the Raleigh Hills area.  Authorities say a man entered the Lucky Dog Deli on Southwest Scholls Ferry Road Saturday afternoon, and demanded money from the cashier at gunpoint.  Deputies say the man fled on foot, and efforts to track him with a K-9 were unsuccessful.  The robber is described as a Latino male in his late 20s with a medium build, wearing a purple bandana over his face.