People who scoop up their dog's mess into a plastic bag, as they should do, and then leave it on the footpath instead of putting the bag of waste in the bin, as they should do. All or nothing; at least if you don't bother to scoop it up, even though that is disgusting, it will eventually wash away in the rain.
Especially as any fewl nows you're suppose to hang them on a tree. Presumably the pooh fairy then clears them up later.
I think that's how it works, but I don't have a dog, so might be wrong.
Mind you, also on an animal theme, our new (rescue) cat is extremely timid and has spend her first couple of days with us finding increasing ingeneous hiding places, and each one that gets rumbled is replaced by an even better one. Behind the kitchen cupboards amongst the pipes was, I naively thought, the ultimate - but we knew where she was, and could keep an occasional eye on her. Not good enough - she's only disappeared up the f-in' chimney now ! Hopefully she'll eventually decide to come back down to get some food. I'm dreading her getting stuck or escaping onto the roof - with no-where to then go. A dead cat stuck up the chimney is one scenario I don't really want to have to deal with.
EDIT - cat not up chimney after all, or at least, she's come down if she ever was there. If she's found yet another hiding place, it's a bloody good one
