My cats smile. Yes… they do. No… I’m not touched. If you look at a content cat… it will be smiling. But you have to look at the side of of their face and the mouth will be curled up at the ends. And it’s not always like that. Look at the side of the kitties face whan the aren’t happy. The mouth will be a straight line.
But don’t look for a frown. Kitties don’t frown. They just give you “the stare” to let you know they are not happy.