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the hypothesis that dogs learned some expressions to communicate better with humans makes sense, but some expressions like showing the teeth to express disapproval is present in various mammal populations

some of them are present in the mammal world, so I’d guess they are universal among humans, at least to a certain degree

Unfortunately I don’t have much faith in this social network until the bot issue is addressed. There is a huge contingent of spambots just waiting for their moments here.