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Submissive grinning, sometimes called smiling, is when a dog pulls up their front lips to expose their teeth (check out a video here and a photo here) and it often occurs during an initial greeting (dog to human, dog to dog).
Smiling can send endorphins into our bloodstream. Petting an animal raises levels as well. Albeit, the release of endorphins from these activities may be subtle, they could mean the difference between being in a good mood or a bad mood. Staying positive keeps endorphins flowing.