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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).
Unless you know the dog, snarling should be interpreted as a warning of potentially aggressive behavior. Some dogs show a related behavior called smiling, which is typically a submissive signal and usually associated with tail-wagging. A common abnormality in canine dentition is retention of deciduous (baby) teeth.