I have always said that if a cat is smiling it is not because he is smiling but because his facial anatomy makes it seem like he is smiling but my resolve to stick to that point of view is waning fast. This tabby, who looks male to me, is supremely content and it shows on his face. It is not just the smile, it’s his whole demeanour. It shouts ‘I am content’ and look at his human. She’s content too. I have just written a post on that: how companion animals are in synchronisation with their guardian with respect to feelings. So if you’re stressed your cat might be too but if you’re smiling your cat smiles with you.