P.F.R. dogs

the P.F.R. dogs act like a robotic police force. They have a tracking system, their ears act like antennas. They scan people as they walk past, scanning for illegal weapons and substances. Spikes on their back are used as a defense. Hatches on their sides open so they can use rockets that they can fire at dangerous criminals if they need to. Commands and goals are programmed into them and have to be reprogrammed daily as they complete these tasks. There are at least 50 per town, 150 per city, though there often more.