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Willoughby (sometimes spelled Wiloughby) is a dumb hound character of the Merrie Melodies series. According to Chuck Jones, the character was based on Lennie, from Of Mice and Men.
Willoughby is a hunting dog, but does not do his job well.
- "Of Fox and Hounds" (1940)
- "The Crackpot Quail" (1941)
- "The Heckling Hare" (1941)
- "Nutty News" (1942) (cameo)
- "Ding Dog Daddy" (1942)
- "An Itch in Time" (1943)
- "Hare Force" (1944) (as Sylvester the Dog)