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A comment on Just how smart is an octopus?. Parent comment

Re:Just how smart is an octopus? by prodmerc on Monday January 09, 2017 @04:31PM (#13359989)
No, dogs don't smile. Some learn the baring of teeth as being peaceful instead of defensive, but most of them don't, or rather can't smile.

You can find the same exact "smile" in goats, sheep and pigs, they're definitely not making that face because they're happy.

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Re:Just how smart is an octopus? by enraged_camel on Monday January 09, 2017 @05:30PM (#13360436)
Yes, wrong example. Anyway, science has shown us that human-dog coevolution does have a noticeable impact on the way we interact with dogs. Specifically, sustained eye contact between a human and a familiar dog raises oxytocin levels to increase in both. The same type of relationship has not been demonstrated with other domesticated animals, to my knowledge.

https://www.scientificamerican.com/article/is-the-gaze-from-...

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Re:Just how smart is an octopus? by Johnythree on Monday January 09, 2017 @05:33PM (#13360457)
Yeah, I know all that.

But a dog's smile is so much more, posture, sounds, tail wagging..

A dog's smile makes me smile.

And for that matter, humans can bare their teeth as well..

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