Not to Belabor the Topic of " Doo doo on my Balcony"

I finally heard back from my other neighbor. She, too, has found inexplicable piles of dog poo in her back yard and on the driveway. Neither of us own a dog or can explain why the poo appears to have been dropped on the driveway or in my case thrown onto the balcony. She does not have a balcony which probably saved her from the irritation. The mystery continues.