Marilynne I thought a sun-dog was when a ring forms around the sun in a sky with ice crystals.
https://en.wikipedia.org/wiki/Sun_dog
From your link - Sun dogs typically appear as a pair of subtly colored patches of light, around 22° to the left and right of the Sun, and at the same altitude above the horizon as the Sun.
This was to the left of the sun.
[h=3]WHAT ARE SUN HALOS?[/h]
You may have heard of a related phenomenon called a “sun halo.” In this case, it’s an entire circle of light 22° wide around the Sun. Similar to sundogs, sunlight is refracts through ice crystals; these hexagonal ice crystals are suspended in cirrostratus clouds.