Ecto Doge makes a cameo appearance in Go! Go! Pogo Cat, along with Pigeon de Sable and Brollow. It is the latest occurring of the three, and can only be seen drifting through the background after the 20th checkpoint is reached.
The Burgle Cats
Ecto Doge takes on two different forms as traps in The Burgle Cats.
The blue flames next to it are hitodama, which traditionally surround Japanese ghosts and those they possess.
Due to the near-identical katakana spellings, the Ecto Gang's Japanese name, Ghost Masters (ゴーストマスターズ Gōsutomasutāzu), may be a reference to the movie Ghostbusters (ゴーストバスターズ Gōsutobasutāzu).