Police dogs, or K9 units, are highly trained working dogs that assist law enforcement agencies in tasks like search and rescue, tracking, and apprehension. While the best shock collars may be used in their training, the specific brands and models can vary among departments and trainers. Popular brands/models of best shock collars used by police and working dog units include Garmin/Tri-Tronics, known for their few training modes and GPS tracking capabilities. Dogtra offers durable best shock collars with various stimulation levels and range options. SportDOG specializes in training equipment with remote control operation and extended range capabilities.