Has it got a baby? As when an adult has a baby on the screen it doesn't have stink lines before it poo's- instead it pulls a face- it looks odd- sort of sad- but if you go to the toilet icon when you see it screwing it's face up you can still get the adult to the toilet!
wierd. my ^_^ was turned on its side, i thoght it was leaving, but it made a poo, and none of my adults have done it sence. (well, i havent seen them do it.)
maybe the hearts are not filled because when they have a baby instead of calling for attention they sometimes have a sad look on their face try feeding it and playing with it cos it happened with my decotchi with baby