There was this idiot in my old neighborhood who use to walk his two large labs around the block every morning. The dogs had decorated my lawn a few times before so I asked nicely if he would clean up their mess, he refused. At the time I had three dogs myself.
The next time his dogs did "their business" on my front lawn. I picked up the mess, then waited till nightfall. Around midnight I deposited His dogs "business" in his mail box as I drove by it.
I think what pissed me off the most was when I was playing with my then two year old daughter on the front lawn, she stepped in his dogs " Business"
Never a problem again. Mail call!!