This drives me nuts. It's not hard to clean up after your own stupid mutt. At. All. I do it, all I ask is that my redneck neighbors respond in kind.
Heard/saw one of my non-redneck neighbors go nuclear two days ago on one of the perps about this. She landscapes a lot of the people's yards in this development and had been running over bombs on the reg for over a month. She lucked in to catching the culprit in the act of ####ting on her yard and unloaded on them. Response: "Oh, I didn't know I was supposed to pick up after it." She practically stripped this chick's skin from her back with the diatribe(was in my backyard and could hear it a block away). Girl was apologetic, "No, I don't know what its like to have a lawnmower in my garage that smells like #### all the time, I'm sure that's awful", etc, etc. Saw her yesterday walking the dog, bag in hand. Thought "Okay, maybe she's been straightened out. Good for her." Later that night my dog decides to spontaneously roll onto his back on our way back in from his last whizz of the night. Me: "That's odd. He doesn't do that very oft----oh, Jesus is that dog####?!" Spoiler: It was dog ####. In my front yard.
Saw another two bombs when I walked our dog again tonight, including on the property line of the landscaper lady's yard. Some people are just completely, willfully ignorant/#####. I'm thinking of harvesting every briquette'd turd I find this week and placing it on top of their mailbox.