This is the first shot of the First Dog, Bo, according to The Los Angeles Times.
The paper credits the shot to Pete Souza, the Chief Official White House Photographer. It was apparently taken at a getting-to-know-you session Bo had with the Obamas a few weeks ago.
More details here.
Souza is an interesting guy himself: an Ohio University professor, on leave of absence to handle the top job at the White House. Here’s his bio.