K-9 refers to specially trained dogs that assist law enforcement and other agencies in various tasks. These dogs are often used for detecting drugs, explosives, and even tracking missing persons. Their keen sense of smell and strong instincts make them valuable partners in ensuring public safety. K-9 units typically consist of a handler and their dog, who undergo extensive training together. The bond between the handler and the dog is crucial for effective teamwork. K-9s can also participate in search and rescue operations, making them versatile assets in emergency situations.