no this, no that, some confusion

So... First of all, when someone tagged the sign, he (or maybe more likely she) used a sticker. Very courteous, not to paint on public property!

Next, are they out of order? When you play ball here, do not foul the dog?

And why do two things have a line through them and the pooping dog doesn't have a line through? If you foul the dog, will you cause him to defecate?

These things I do not know.