With no clue as to how to describe a sundog, I will just give the definition.
I describe them as amazing and I missed another one last night.
Sundogs are visible when the sun is near the same horizontal plane as the observer and the ice crystals. As sunlight passes through the ice crystals, it is bent by 22 degrees before reaching our eyes, much like what happens with 22 degree halos.
Way to technical for something so amazing.