Most of our time spent at the dog park involves Riesling barking at dogs on the other side of the fence so she can chase them or barking at other dogs in the same area just because. Today she was in a particularly playful mood and spent significant time running around with a maltese-yorkie mix named Gizmo.
(quick apologies for the cameraphone quality)
She was so tired after an hour or so of this that she lay down next to me when I asked her to. First time ever at the dog park.
She is currently happily cashed out on the futon. :)