What's a "sun dog"?

Sun dogs, also called mock suns, are colored, luminous spots caused by the refraction of light by six-sided ice crystals in the atmosphere. These bright spots form in the solar halo at points that are 22 degrees on either side of the sun and at the same elevation as the sun. Here is another example (this was actually taken in Arizona, also, but not by me):



This is a good place to see all kinds of sun dog photos: http://www.flickr.com/photos/tags/sundog/

Good job, Angie. You get the extra Christmas present. (Next Christmas.)