Job:  To guide their visually impaired or blind handler. Handler:  May or may not show signs of visible disability. Gear:  Visual Assistance Dogs will wear a guide dog harness, typically of which at least some part is white. White is the color protected for use by guide dogs and visually impaired individuals. Notes:  Visual Assistance Dogs are commonly called ?ǣGuide Dogs?ǥ or ?ǣLeader Dogs.?ǥ Most are Labrador Retrievers, Goldens or German Shepherds, but they can be any sturdy, even-tempered, medium or large breed dog. excerpt taken from https://www.anythingpawsable.com/types-of-service-dogs