There is a distinctive and easily recognized open-mouth expression that is the canine equivalent of a human smile, illustrated here.

Sherri Shepherd is known for her sparkling and inviting smile. So when the talk show host posed for photos at Gayle King’s surprise 70th birthday party with a closed mouth, something was ...

The closed-mouth expression is usually associated with the dog looking in a particular direction. This is a sign of attention or interest. The smile is now gone, mostly because the dog is now ...