I'm guessing it was over twenty feet tall.
As I was returning, in the western sky I spotted a sun dog to the right of the sun and I had to pull off and try to capture it. Further on, where there was an unobstructed view, I could see sun dogs on either side of the sun -- but couldn't capture them and the sun on one shot.
Sun dogs are reflections on one or both sides of the sun, always at the same distance as the sun from the horizon. The ones I saw today were fairly vague -- click on the link for pictures that make it look as it there were three suns in the sky.
Wouldn't that be an omen!