By Robert Husseman / The Bulletin
August 3, 2011
Its tail wagging anxiously and pink tongue hanging, a shiny black Labrador stands on a 40-foot-long wooden dock, perched six feet off the ground. At one end of the dock is a four-foot-deep pool, 40 feet long and 20 feet wide.
The dog's handler stands at the edge of the dock nearest the pool and....