Scooby-Doo played decoy as a champion show dog to lure out the local dognapper and find the other stolen dogs. Fred Jones tucked the transmitter into his fancy-looking new dog collar to keep a tab on his location when the dognapper eventually caught him and took Scooby back to his hideout. The transmitter was connected to an antenna mounted on top of the Mystery Machine which was in turned connected to a monitor which showed a technical read-out of where he was.