Originally Posted by becky.g!

I have a one year old female Staffy, Millie, who is a rescue dog. When I pet her, the corners of her mouth turn up, as if she is smiling. She doesn't show her teeth or open her mouth, it's just like a human smile with the corners of the mouth. More like this; than this;
You can see by the shape of her eyes at the time that she is happy, so is this a smile, or just a natural facial shape? When we first got her she was very timid, but she 'smiled' when we showed her love, something she hadn't been shown much of before.
I searched the internet to try and find out but everything I could find was relating to the dog opening the mouth and panting with a smile-like expression.
Anyone know?