Intervention dogs in prison units are fundamental in helping operations that demand action in situations of stress and controlled force with the prison population. The prison system is an area where the dog can be used the most, whether for intervention, scent, searching and operations to inhibit drug trafficking. This mission is performed by the canine technician and his dogs. Dogs are distinguished by racial types, temperament and learning characteristics, which make them excellent working partners. This article contributes with the description of specifications for the use of the dog in the prison system of the state of Rio Grande do Sul, Brazil, regarding the regulation and the legal foundation, the profile of the operational dog, the training, the security of the dog-police binomial in routine tasks, with the dog playing a supporting role in tactical employment and the talent of the canine technician who leads him on a leash.