|This needs a stretch. (Feel free to remove when satisfied of completion.)|
Needed: History is incomplete.
The costume's physical resemblance to Scooby-Doo, a brown-furred, fully-grown Great Dane, was perfect, despite being collarless and having bushier eyebrows and a harsher expression.
The impostor didn't do a good enough job acting like Scooby, such as not not talking, being fiercer, and not showing the same interests. This gave the game away to Shaggy Rogers.