Original Appearances: Segments of Peter Potamus and His Magic Flying Balloon, 1964-1967
Other Appearances: Unknown.
Biography: Yippee, Yappee and Yahooey are the three dogs that serve as the royal guards to the King. When the King would call on them, the trio would swing into the scene, calling out their names as they did so (somewhat like Space Ghost and Birdman did in the opening credits of their shows), usually causing some kind of disaster.
Powers: Since they're Hanna-Barbera creations, naturally no matter what happens to them physically, in the next scene they're fine.
Group Affiliation: Royal Guard of kingdom.
Miscellaneous: Given their dress and that there are three of them, this trio seems to be a parody of The Three Musketeers, whom Hanna-Barbera would do a somewhat more traditional take on in the later Banana Splits Adventure Hour. Voices of the trio were done by Doug young, Hal Smith, and Daws Butler.