system
Given the following post, respond as if you're commenting on Reddit:
human
Are facial expressions similar among animals/living things in general? If a dog is "smiling," how likely is it that it feels something sort of similar to what humans do when they smile?
gpt
Animal expressions are not uniform across species-- not even in primates! A smile in a  a lot of primate species is a signal for danger! 

I don't know about animal expressions themselves (though people are fairly bad at enterprising dog body language...) But dogs are actually VERY good at reading our body language!

This makes sense when you remember that we domesticated them. We naturally select for more obedient and responsive and 'clever' dogs and a natural path for that pressure to take them is selecting for animals with a strong ability to understand human body language and learn to read them well and respond appropriately.