My puppy did one at the park today and I had no idea how to clean it up. It's not like I can pick it up as it was pretty much a puddle of poop, I had no tissues or anything to help with solidifying it, sort of. I felt really bad about just leaving it there, but no idea as to what I could have done.
Oh, and in case if anyone wonders- she stole some smoked salmon from my daughter's sandwich. It goes straight through her.