The cat and mouse duo, always trying to best each other, debuted over 80 years ago and still remains one of the most beloved ...

Barbera teamed up with animator and director William Hannah, 27, and together, they came up with a conflict between a dog and a fox. Along the way, that idea morphed into a cat and mouse.

And one of those cartoons is actually the Hanna-Barbera series ... with the ability to scare off the little cat that scared Little Dog with his bark. Apparently Big Dog was an English Sheepdog ...