"TexasRedneck", I would agree, assuming along with the fence, it is legally posted. Most people I've seen just reply "I didn't see the signs". We used to make arrest if someone ignored a "fenced property" for Trespassing, especially if a 6' privacy fence and the owner wished to pursue charges. With current liberal interpretations of the laws that's not happening in some large cities, even with legal posting.
I informed a whole city department that ANY one of their employees that set foot on my property without legal authorization, i.e. a warrant of some type, would be charged with trespassing. I delivered in person to the head of the department. It was obeyed.