Sun Dogs are a relatively rare occurrence. Sometimes, usually in Winter, when the sun is low on the horizon the sun's light can be projected thru ice crystals high in the atmosphere to create a second, or ghost image, of the sun. In this image the actual solar disk is at the right behind the utility pole and the "sun dog" is to the left where you see the disk and a vertical colored column.
Often sun dogs occur as pairs on opposite sides of the solar disk as in this example.There may have been another ghost image yesterday but I could not see the portion of the sky in the other direction.
Cromwell CT; February 8, 2014