Hoppy is a fictional character on the television series The Flintstones. Hoppy is a pet hopparoo (similar to a kangaroo) owned by the Rubble family. Hoppy debuts in the fifth season episode Hop Happy (1964).
In the episode, Barney and Betty Rubble acquire a new house pet. The pet in question is a hopparoo, which is a combination kangaroo and dinosaur. Fred Flintstone regards "Hoppy" as an overgrown and obnoxious nuisance until the fateful day that the Flintstones and the Rubbles go out together on a picnic. The families' lives are endangered during the picnic and Hoppy goes for help. Scriptwriter Warren Foster harks back to his days with the Warner Bros. cartoon unit in the scene where Fred and Barney mistake "Hoppy" for a giant mouse. He babysits the kids as he takes them around in his pouch.
One of the best moments of the series was in Episode 2 of Season 5, when Fred's frustration with Hoppy boils over and the two characters box. Much to Fred's dismay he loses after only a few seconds, with a kick to the stomach.
Hoppy appeared sporadically through the end of the series and is featured in various Flintstones merchandise. Most notably, he appears in The Flintstones: The Rescue of Dino and Hoppy video game for NES, made by Taito. A CG animated hopparo makes a small appearance in the Flintstones second live action movie "The Flintstones in Viva Rock Vegas" and while not meant to be Hoppy it was a clear reference to the character.