At the end of Jack's life, Vincent re-appears and helps Jack make the transition from the physical to the spiritual world.

So the “Lost” were found but to me, it was never about the people finding redemption–it was always about Vincent, the Yellow Lab.  He survived the crash and was there at the beginning of the story and there at the end.

To dog lovers, “Lost” was always about Vincent and all the dogs we get to share our journeys with and how these truly spiritual and loving beings who aren’t here for us but are here with us help us become our best selves, our truest selves.  Goodbye Vincent.