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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).
Â· just now. Report Abuse. Yes, when a dog shows his teeth his is showing aggression. But there are different types of aggression, and 9 time out of 10 a dog will show his teeth as a warning that if you get to close something more terrible may happen.However, since this dog has jumped you after showing his teeth he means business. just now. Report Abuse. Yes, when a dog shows his teeth his is showing aggression. But there are different types of aggression, and 9 time out of 10 a dog will show his teeth as a warning that if you get to close something more terrible may happen.