In San Francisco Diggs a German Shepherd police dog and his master Shane are called to a hostage situation. Diggs deliberately ignores Shane`s commands. He attacks the suspect causing him to release a device that Diggs grabs which causes a building to blow up. Butch and Lou are watching footage of the incident. Lou wants Diggs to be an agent with Butch as his mentor to help bring down Kitty Galore. At the police station Diggs is suspended and sent back into the kennels. Shane wants to adopt Diggs but the police will not allow it. Butch recruits Diggs and takes him to HQ. Lou gives them a mission to track down a pigeon named Shanus who is an informat and apparently works for Kitty Galore.