More than 300 urban rescue dog/handler teams responded to the collapse of the World Trade Centers on Sept. 11, 2001. Wilderness: These dogs detect human scent in search of people lost in the wild. Evidence/article: Dogs highly trained to find items that have human scent on them. In urban disasters, where people are trapped beneath precarious piles of debris, a dog's strength, confidence and agility are key. Even more important, though, is obedience: An out-of-control dog is a liability in ...