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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).
A dog may also lick their ownerâs face for this same purpose. Dogs also engage in licking behavior out of nervousness or because of feelings of anxiety. Licking may help to relieve the nervousness. A dog may lick as a way to try to appease someone higher in the âpackâ and the pack may include their owner.