It wasn't Hanna-Barbera, it was W. Watts Biggers, who was a full-time professional ad-man until General Mills came up to him and demanded a cartoon show to go along with their latest cereals. At first they offered it to Jay Ward, who would have been in contractual conflict with his similar arrangement with Quaker Oats. He did have an early hand in development, though.
Pretty sure this isn't a Hanna Barbera. Whatever is left of my childhood seems to be telling me that whoever did this also produced GoGo gophers, Klondike Cat, and Tennessee Tuxedo. GoGo gophers was probably the most interesting as it was still sort of subversive to cast the indians as the heroes.
Dumb kids these days with their funny, well-animated cartoons that parents could watch with them and enjoy. Back in my day we had a half-dozen barely-animated parodies of film serials created by ad men consisting of nothing but bad puns and we LOVED it!
This flying super-dog has the nerve to call himself "underdog," like there's a bunch of even better dogs just flying about and he's the crappiest one. This premise is too confusing, hopefully this gets retooled next season.