There were many places, in fact. Garages, sheds, forest, I think this is not unusual enough.
When I was doing military service, I was doing this with a bitch to the cabin of the 19ж6 radar station.
This was the only place where the two could hide at that moment in time. It was terribly uncomfortable, but I think it is quite unusual.
Eight years later, I suggested that my dog do this in the transport compartment of the IL-76, which was in the air. We flew from Moscow to Novosibirsk, and it so happened that we were completely alone in the compartment at that time, not counting the cargo.
But the dog categorically refused, so this case does not count.