Why? The Breath of a Small Dog

The breath of a small dog, it's the smallest thing. A bit larger thing is the sigh of a small dog.  It is a bit larger than a normal breath and the exhale is larger and longer. It is a sign of being at peace, contented, and feeling safe. Well, the long and short of this is a Yorke dog named Willie. He sleeps with me and here is the thing. We go to bed and he lays beside me chewing on a small dog bone chew. There comes a point every single night when as I am reading, laying on top of the covers, he scratches at my leg. I open my legs a bit and he maneuvers inside my legs and curled up between my legs and WITH OUT FAIL, HE MAKES A SMALL SIGH. Now this is not a sound, but a feel. It makes me chuckle, gives me a feeling of peace, contentment and also feeling safe. Sigh