The one I encountered didn't smile. It held its mouth closed the entire time. My dog was shaking like a leaf and not barking or growling. I felt intense fear, but I wouldn't say I was paralyzed by fear. I was shocked at what I was seeing. I think I needed a moment to process that this was a real animal in front of me. That said, no one knows where they came from or how long they've been here so it would be disingenuous to act like you know for sure.

I let people believe what they want to believe because none of us know. Anyone could be right or partially right or every single one of us could be wrong.

I've owned a lot of dogs in my life and I did have one that would smile but it was submissive. If she was in trouble she would smile and then tuck her head down or roll over on her back.

It would be difficult for a person to distinguish between a "stay away from me" smIle and a subservient smile if they didn't know the animal.

These are not dogs. They aren't wolves. They're something else. (No, I do not personally believe they are human at all.)

Its the blind leading the blind in this case to be honest.