Dogs smile by pulling one or both lips back and may show all or some teeth. The "smiling" is often accompanied by other greeting behavior s, like approaching, wagging or even whining.

Dogs smile by pulling one or both lips back and may show all or some teeth. The "smiling" is often accompanied by other greeting behavior s, like approaching, wagging or even whining.

Dogs smile by pulling one or both lips back and may show all or some teeth. This smiling is accompanied by other greeting behavior, like approaching, wagging or even whining.

Dogs smile by pulling one or both lips back and may show all or some teeth. This smiling is accompanied by other greeting behavior, like approaching, wagging or even whining.

Dogs smile by pulling one or both lips back and may show all or some teeth. This smiling is accompanied by other greeting behavior, like approaching, wagging or even whining.

Any dog can smile, and according to veterinary behavior specialist Dr. Lore Haug, some breeds are even genetically predisposed to smile more than others (Doberman Pinschers, terriers and cattle ...