At home with no supervision
He is still being trained. We have a strict policy of ignoring Jeffrey when he cries for attention. He is learning that behavior quite quickly and, at the moment he hardly ever cries more than 5 minutes before getting distracted and going to his crate.
However he could get stressed and afraid if he were to be left unattended for more than 2 to 4 hours. Avoiding long periods of loneliness will translate into a calmer and well behaved dog.