While federal law doesn't mandate that Service Dogs wear any kind of gear or identification, most Service Dogs have some kind of vest, jacket or harness. Sometimes, the gear is for identification only and at other times, like in the case of a brace dog or a Service Dog who carries medical equipment, the gear is utilized during the dog's work. There are too many types of Service Dog harnesses and vests to mention them all, but here are 5 of the most common items!