(NYT16) NEW YORK -- June 6, 2006 -- WORKING-DOGS -- Carl Massicott reaches down to a cup to reveal a bed bug successfully detected by Jada during a training exercise in Massicott's home in Milford, May 17, 2006. Dogs have been longtime partners in law enforcementŐs searches for narcotics, explosives and bodies (both dead and alive). But now their olfactory sense has been harnessed in industries like medicine, environmental protection and Hollywood. Dogs have been trained to sniff out mercury in Minnesota schools, invasive weeds in Montana, cancer in patients -- even cows in heat. (George Ruhe/The New York Times)