Walt Disney character originally called Dippy Dawg who first appeared in 1932 animated cartoon Mickey's Revue (5)
I believe the answer is:
goofy
(Other definitions for goofy that I've seen before include "Silly, wacky, sappy" , "Disney cartoon character" , "Silly -- ridiculous" , "Harmlessly eccentric" , "Disney's anthropomorphic white-gloved canine" .)