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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).
Life Span: 12 to 14 years. 1  It's known as the Sammy smile, the slight, but discernible, upturned corners of the Samoyed's mouth. This is a happy, good-natured dog with a glass half-full attitude toward life and the people he lives with.