In Adventure Time: Fionna & Cake, Jake’s fate is left deliberately unclear on screen, but all the context strongly points to him having died sometime before the events of the series.

What the show actually shows

  • Fionna & Cake is set years after the original Adventure Time, with Finn now an adult adventuring solo.
  • Jake never appears in the present-day timeline, and Finn is consistently shown without him, which is a big contrast to the original series where they were inseparable.
  • This absence functions as a quiet implication that Jake has already passed away by this point in Finn’s life.

What creators have said

  • Showrunner Adam Muto has hinted that, during Fionna & Cake’s timeframe, Jake is effectively gone, strongly implying he is dead rather than just “off-screen.”
  • At the same time, Muto has said he likes leaving Jake’s situation partly to the audience’s imagination instead of giving a detailed, on-the-nose explanation.

Why it (sadly) makes sense

  • In Adventure Time, Finn and Jake are the same age during the original series, which ends when Finn is 17.
  • By Fionna & Cake, Finn is clearly an adult, and since Jake is still a dog (even a magical one), it’s reasonable in-universe that he would have died of old age sometime between those points.

Is there any “official” death scene?

  • As of the latest discussions and coverage, there is no on-screen death scene or explicit canon explanation of exactly how Jake died in Fionna & Cake.
  • The series, interviews, and analyses all converge on the idea that he is gone by this era, but the details are intentionally left ambiguous for fans to interpret.

In short: Fionna & Cake strongly implies Jake is dead by that time, but never shows his death or spells it out directly, leaving room for fan theories and headcanons.

TL;DR: In Fionna & Cake, Jake doesn’t appear at all, and creator commentary plus story context strongly suggest he has already died (most likely of age) before the series, though his exact fate is left purposefully vague.

Information gathered from public forums or data available on the internet and portrayed here.