Army dogs serve important roles by assisting soldiers in the armed forces. They are trained to detect explosives, locate wounded soldiers, deliver messages stealthily between troops, and detect mines. The most common army dog breeds are German Shepherds, Doberman Pinschers, Belgian sheep dogs, Farm collies, and Giant schnauzers. These dogs take on roles like sniffing explosives, aiding search and rescue missions, and alerting soldiers to dangers. Their strong sense of smell and training allow them to support troops in crucial ways.