Don't throw the dog poop onto the neighbor's walkway. Don't mail the poop back to the dog owner. So you'll want to stay out of legal trouble and think about other options. read more
Scoop the poop and put it in your neighbor's yard, then spray your yard with any type of dog away spray you can find at the pet store or Home Depot. Eventually your yard won't smell right to them and their yard will smell right and the dogs should stop wanting to go in your yard and instead want to go in their own yard. read more