There are one or two culprits around the neighborhood, and I'm hoping this cheery sign guilts them into taking the poop with them. Trying to figure out how to attach a canister with bags to it to make it that much easier to be considerate.
There's a neighbor around the corner with a sign claiming "all dog poo DNA tested" so Charlie wanted the sign to say "Please leave your address so my dog can poop in your yard." That may be next if this doesn't work.