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Abdulelah Alzaidi
:: مسافر ::
I don't know that I'd really recommend this, but I know people who pick up the poop and put it on the owner's doorstep. Leave a friendly/funny notecard about how doggie is leaving gifts that aren't welcome. Sounds like it might be pointless (dangerous?) with your neighbor tho. I wonder if the animal control dept would be appropriate here? You might at least call them and see if they have suggestions since they deal with loose animals a lot.