Just so I don't overstep any boundaries: are the businesses with no "employment" header still open to work (low-level positions) at?

I'm specifically curious about the stables. What with Atsushi not feeling so great about working at the Institute anymore, I was wondering if he could reasonably switch to the stables - just taking care of the animals: feeding them, cleaning them, looking after them if they don't seem well. He has no real ambition to ride anything, but if training animals to be ridden would become a part of his job eventually - say a few months in - he'd give it his best shot.

One more obligatory "I overthink everything" question: if Atsushi can work at the stables, would he be allowed to bring his cub to work? >>