Oh, man. Can you see Sam dealing with a hyperactive squirrel version of his brother? Especially since he isn’t his moose self, like on the show. If he can get Dean to sit still for a few minutes, he could always hitch a ride on the squirrel. They could have an adventure together.
…But if they want to get Dean back to normal, they should call Bobby. Especially since neither of them can now drive the Impala. Yep, definitely call Bobby. And deal with Dean’s constant bitching about anyone else finding out that he’s now a squirrel