My mailbox is the neighborhood dumping ground. Doesn't really bug me, as I'm not really accustomed to picking up dog shit either (mine just uses my yard)...but one lady was throwing a fresh bag in my emptied trash can every Friday. So I got to haul her poop into my garage sauna to let it baste for a week til the next pickup. After a couple weeks I'd had enough...simply threw it in the street where she'd walk by and find it the next morning. Giving the poop back is extremely effective I have found.