Well the newest is a combination of negligence and plain rudeness! I was gone for a month, in B.C. getting married. My dearest husband was only gone for that last week. In that week, they realized we weren't home, and have been letting their dog poop on our front lawn. No, there is no fence. No we don't mind them or anyone on that lawn. But We are the ones who mow it. And when we just moved in and didn't have a mower, they would mow the law in front of their house, and in front of everyone else's house in our row but ours.
There is a pile of doody right beside our doorstep, and 4 piles in our 2 meter by 5 meter patch between the house and the car.
Options: talk to them rationally.
Pick it up and if it happens again, talk to them.
Pick it up and put it on their lawn.
Put it on their doorstep.
Let our pup poop only on their lawn.