I've analyzed our three shibas. One male was raised with regular breeds aka real dogs, so he's basically a lab or some equally needy, always licking, excited to see people type dog. He's no good for this job. Our other male, he'd let everybody steal shit because he's a pussy.
Our female though. People wouldn't fuck with her. She's an angry little fluffy bear. The novelty of cute dog running a shop is backed up with a creature that would kill a man if she could get away with it. She will lick your hand while choosing your fate.