Captain Dave Poulin
Imaginary Cat
On the topic of non-Hanna Barbera 60s cartoons, I know Underdog was apparently a favorite of both of my parents in their respective youths. They got me a DVD of it when I was a kid and we went to see the crappy live action movie, too, haha.
Oh Hells yes, it was awesome - one of my favorites. I have figurines of all the major characters and a Frisbee with him on it lol