The nice thing about being a dog, Scooby might have thought were he were prone to introspection, is that one could get away with some pretty incredible things just by virtue of being a 'dumb animal'.  Wandering right through an open doorway marked Employees Only, for example.  Most people watching would be checking for someone in the top half of the frame, and so a moment of inattention might give a better opening for a quadruped...<br/><br/>And so he trotted back into the shop, sniffing and snuffling about, acting for all the world like he'd just made a wrong turn on the way to the nearest fire hydrant, ears peeled for anything useful!