A sun dog, a frequent atmospheric optical phenomenon, is a bright "spot" beside the true sun.
Yesterday I saw a "sun dog": a rainbow around the sun.
Even fractions of parhelic circles are less common than sun dogs and 22 halos.
These luminous spots are called "sun dogs" or "parhelia".
On rare occasions, faint arcs extend upwards or downwards from these sun dogs.
As many as three distinct arcs may extend from the sun dogs.
The colors of the sun dog finally merge into the white of the parhelic circle (if the latter is visible).
It is theoretically possible to predict the forms of sun dogs as would be seen on other planets and moons.
A sun dog (parhelion when it's being posh) is an effect seen around the sun.
But sun dogs are indicators that weather conditions are likely to change in the next 18 to 36 hours.