The fate of Jake in Adventure Time: Fionna & Cake is unknown, and it is unclear whether he is alive or dead in the spin-off series. The spin-off series is set in the future, with Finn as an adult, making it logical for Jake, as a dog, to pass away by that time. Although the episode doesnt quite confirm Jakes death, there are hints that support the implication. In an interview with Inverse, Fionna & Cake showrunner Adam Muto confirmed that Jake is dead, but went on to say that "Weve shown Finn and Jake at the end of their lives. How it resolves. Thats the more...". However, Muto also stated that they’ve left Jake’s fate ambiguous since “it wasn’t important” for this series. Despite the ambiguity surrounding Jakes status, there is a possibility that the series may feature different versions or references to him. Its possible that Jakes presence in "Fionna & Cake" could be revealed through flashbacks, alternate universe versions, or other creative methods.