So dogs, who have 44 times the sniffing power of humans, can pick up the scent and follow it. A much larger part of a dog's brain is devoted to processing smells than yours. Dogs can be trained to ride in anything from helicopters, trucks, and boats, to sling harnesses and chair lifts. Some search dogs locate people buried under the snow of avalanches, search for evidence in crime, and find people in the water. Cloudy days, mornings, and evenings are the best times for dogs to search.
Dogs navigate in brush better than humans.