So good to see people who take such good care of their animals. I hope, this is not the biggest place to run he has. Poor animal wants to run and play, but everywhere he goes, it’s blocked by walls.
It would be more adorable if he had more space to run around!
They probably have a pasture and lots of room. Like horses have stalls they spend time in and then they let them out to graze.
When donkeys/horses have babies, they are usually kept in small enclosures until the foal is big enough or healthy enough to roam outside in the actual pasture.
They also keep them in «quarantine» to prevent them from possibly catching anything from other animals, since they have weak immune systems then.
Video is on the next page: