He suffers from severe separation anxiety. It's a serious case. Even when they are in the house together, if Guest is out of his sight, he immediately starts whining and goes looking for them. When sleeping, he absolutely must be glued to Guest to feel their warmth. They tried sleeping separately once, but it failed miserably. Whenever Guest tries to go out, he clings to their pant leg, begging them not to leave. If they finally manage to pull away and go out, he cries until they return, causing a nightmare of noise complaints from the neighbors.