Background
Jake was conceived when his father, Joshua, was bit by an Extra-Dimensional Creature during an investigation with his wife Margaret. Jake was later born from the pustule on his father's head from the creature's bite and was taken by Joshua and Margaret to live alongside their natural-born son Jermaine. It is inferred that Jake's Stretchy Powers that he has had since he was a puppy are a result of his biological relationship with the shape-shifting creature although according to him (in the episode "The Witch's Garden[1]"), he rolled around in a magical mud puddle when he was a puppy then just became a magical dog. Little is known of Jake's past with his family, but for a while he was known to be a successful criminal until he retired to take part in a more respectable life as an adventurer with Finn, later settling down with Lady Rainicorn to become a father.