Halo Dog

I took this picture in black and white about six years ago. My dogs are sitting in my truck with the window down. The sunlight is coming in from behind me to the right. When I developed the picture I saw this "halo" around my dog's head. I have asked many friends if they can discern what this may be, but nobody to date can tell me. See if you can figure this one out...........?

Received from Scott Dyer SLDYER@peoplepc.com