I’ve been practicing drawing dogs lately like Pluto, Meathead and Dimwit so I thought I’d share a model sheet of Willoughby, the original (I think) or at least the first to say “duh” between each line, stupid dog. I never get bored of watching him or any other dumb dog characters get out-witted over and over. Willoughby starred in one of my favorite Bugs Bunny cartoons “The Heckling Hare”. He first starred in “Of Fox and Hounds” directed by Tex Avery in 1940.
Model sheet from “Of Fox and Hounds”
Cartoons, Comics & Model Sheets 
The first one is probably from “Crackpot Quail”. The McKimson influence is clear. – Thad
I do believe you’right, the Quail model sheet was also in the same book.