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K-9 is Marvin the Martian's pet alien dog. K-9 debuted in the short "Haredevil Hare", where he and his owner Marvin tried to thwart Bugs Bunny, who had stumbled on the pair's plans to destroy the Earth.
In his debut short, "Haredevil Hare", he seems quite unintelligent and gullible. This changes in later shorts where K-9 carries an air of superiority over his owner. In "K-9 Kaddy", K-9 proves to be ticklish when two alien gophers tickle his belly and chin with feathers.
- "Haredevil Hare"
- "The Hasty Hare"
- "K-9 Kaddy"
- "K-9 Quarry"
- "Star Warners" (cameo)
- The Looney Tunes Show