I've inherited two cats with the flat. One has a demeanour like Eeyore. He stares, inconsolable and silent for most of the day.
Back when he was constipated, he got meds, and whenever he used the tray the household gave him affection, and a treat to eat. But the treats stopped when nobody noticed. So now we have to noticed.
The treats are gone, he's been healthy for years, but he announces every visit. The pooping warcry rings throughout the flat.