I don't understand what's wrong with people sometimes: the other day I saw this little flotilla of dog turds on a sidewalk on 14th Street. It wasn't even really close to a tree box. I know dogs do their business where they choose, but at least give it a shot.
And no matter where Spuds chooses to poop, it's super easy to carry a plastic bag with you, pick up the result, and toss it into a garbage can. The cans are usually not more than a block away in any direction. Thankfully I didn't step in this archipelago of poo, but they were certainly step-in-able.