|This needs a stretch.|
* Physical appearance.
The squirrel is the presumably domesticated rodent of Crystal Cove High School's science class.
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It seems at peace, unless it thinks it's food is going to be stolen, then it will attack like a rabid animal.
Scooby-Doo! Mystery Incorporated
While the gang brought one of the Slime Mutant's victims for Prof. Emmanuel Raffalo to examine, Scooby-Doo took a fancy to the squirrel's food, which he mistook for a Scooby Snack, reaching into its cage. This act did not go without consequence, and the squirrel attempted to maul Scooby, which went unnoticed by the rest of the gang and Raffalo.