The chuckle comes from Disney's 1946 Pluto short The Purloined Pup, where Butch the Bulldog appears as Pluto's larger, tougher rival. The clip later circulated as part of a Hollywood Edge collection of funny dog sounds, which helped short cartoon animal noises reach editors, soundboard users and meme creators outside their original films. Because the laugh is so brief and instantly recognisable as a cartoon dog, it still works as a quick reaction sound for pets, pranks and playful edits, long after the short first aired.