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Short term I can't think of a reasonable solution other than shoveling the poop into their yard where it belongs. Long term, you can make a fuss to your legal representatives (town council, homeowner's association, etc.) and have your other neighbors do it as well. Sometimes it takes a group of organized, disgruntled citizens to get things to change, and a healthy dose of time. If your local area can pass a local law about loose pets pooping all over the place, then fines can be levied against the guilty party. Make it a weekly fine until the guilty party fixes the problem and proves it has been fixed. People wake up when it hits them in their wallets or have liens put on their homes. If they have laws about lawns being taller than 6 inches, they can have laws about pooping in other people's yards.