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Owner David Wyttenbach, left, and Sirius Black have a tug-of-war over a frisbee during a search and rescue dog demonstration at Martha Washington Library on April 20, 2011. Search and rescue techniqueSirius Black finds a young girl behind a table in a demonstration of how he interacts with lost people and then leads owner David Wyttenbach to the person at Martha Washington Library on April 20, 201Sirius Black, foreground, sits near survival gear before a search and rescue dog demonstration at Martha Washington Library on April 20, 2011.Marshall Thorne, center, pets Sirius Black while Jack Guthrie, back right, pets Jutka Terris' dog Juno after a search and rescue dog demonstration at Martha Washington Library on April 20, 2011. Unlik