Most behaviorists don’t really consider a dog “smiling” to be a true grin in the way we think about a human smile.
Many canine expressions can be seen as a “smile,” including widemouth panting, relaxing with their tongues out, and submissive grins. Even aggressive baring of the teeth can be mistaken by some as a friendly greeting.
However, most of the time when dogs smile, they are indeed happy, so it’s easy to relate that expression to human smiles.

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