Ralph is alerted by the secret headquarters that a strange epidemic of people...
The Secret Files of the SpyDogs
Season 1 Episode 10: Obedience/DoggyLand
Ralph becomes impatient with his master's wanting to play Fetch. But then Ralph has a flashback and remembers how the game of Fetch came to be, as told by his old teacher, Dahg Chow. The story relates to the very first Spy Dog, of the name "Fetch."