I'll answer to the best that i can based, and even guessingon state laws.
Why the dog was running loose, who knows about that one. The guy owned the shop/area so maybe he felt he didn't need to so that you were right, he was partly to blame.As for the driver going to jail and being if lawwas broken, I don't think he broke any laws but, and this is just an guess, a dog could be considerproperty(in some states) so it could be considered property damage. There could be several laws that he broke, and because I don't know what state this happened in, i couldn't tell you what laws those were.I don't know if this incident would fall under cruelity to animals in the eyes of the lawbut it is possible.Its definetly that in my eyes.