I researched this because I saw this movie in cinemas when I was like 6 goddamn years old and remembering its existence just now blew my mind. James Gunn screenwrote this. The writer and director of Guardians of the Galaxy, 12 full years before his most successful film. He stated in interviews that he hated Scrappyās guts and ātheir whole goal was to destroy Scrappy foreverā, since the character was famously brought in to Scooby Doo in the 80s to help ratings and was almost immediately overexposed and overmarketed to the point that many fans hate him.
And they totally did. He hasnāt appeared in anything Scooby Doo related since, except for these throwaway allusions as a nightmare-like traumatic event for the rest of the gang. Depending how you wanna interpret those references the canon fate of Scrappy Doo was that he went nuts and tried to kill anyone. Also, according to this movie he was never even a puppy, just āhad a glandular issueā, which makes all those times he went āpuppy powerā really creepy in hindsight tbh
I havenāt watched a SD related thing in years but I spent like a half hour looking into and reading about this. Worth.