Dogs have plenty of facial expressions including smiling. Who ever said they don't smile never owned one. And beyond that, you are right, they have full body expressions too. Plus expressions we don't have with their tail and all. Even Boston Terriers, with their little nubs of a tail, can wag. I find that Bostons are extremely expressive. I work from home and having these doggies here just brings me so much joy. I'd prolly go crazy being here alone all day long if it wasn't for them. After all, who would I have to talk to! And yes, they do answer. I know you're thinking now, hmmm.....this guy is nuts! No I tell you, I'm know for fact I'm not crazy, my mom had me tested!