It’s worth mentioning that, because he left for another dimension prior to Rick and Morty destroying their original world, Snuffles/Snowball may still appear as a central character in a future episode of the Adult Swim series.
Will Snuffles/Snowball return to the franchise with another episode, and will he successfully manage to reclaim his testicles?
I’m optimistic, given the advanced technology on Dog World, though sometimes even science has its limitations.
Rick and Morty has danced around the issue as to whether or not the series would continue to be as serialized as it was before the massive renewal from Adult Swim, and while certain characters have returned in recent episodes, there’s a lot more that have been added.