Why does my dog do that?
Why does my dog smile at me?
Last updated 23 September 2026 · How we write and check this
Short answer
What owners call a dog smile, a relaxed open mouth with the corners pulled back a little and the tongue often lolling out, is generally a genuine sign of relaxation and contentment. Some dogs also show a specific submissive grin with more visible teeth, which is friendly rather than a threat, though it can be mistaken for one by unfamiliar people.
The relaxed, happy smile
A soft, open mouth with relaxed lips, easy breathing, and a loose body is one of the clearest signs of a comfortable, content dog, and it commonly appears during calm play, sunbathing, or a relaxed walk. This differs from a closed, tense mouth, which signals the opposite state.
The submissive grin
A smaller number of dogs, some breeds more than others, show a distinct submissive grin during greetings, pulling the lips back to reveal the front teeth while the body stays low, wiggly, and non threatening, often with squinted eyes and a low wagging tail. This can look alarming to someone unfamiliar with it but is actually a friendly, appeasing gesture.
Telling it apart from a warning
A true warning display pairs bared teeth with a stiff body, hard stare, and either silence or a low growl, while both versions of a genuine smile come with loose, wiggly body language and soft eyes.
Key takeaways
- A relaxed open mouth generally signals genuine contentment.
- Some dogs show a submissive grin baring the front teeth as a friendly greeting.
- Body looseness and eye softness distinguish a smile from a warning.
- A stiff body with a hard stare, regardless of the mouth, signals something very different from a smile.