“What are we going to pick the dog’s poop with then?”
Your hand, washing is optional.
How about going really "natural" and just let it turn into compost where it falls? Isn't that the most natural thing to do? Do it in the name of the environmentalist whackos ;-).
In the old days people walked around dog poop. It just sat there. After enough time, a green circle of grass would mark the spot.