[wdfifteen]

A fence seems like the best solution. Make it really ugly on their side.

It's a good idea to keep your dogs on your property. A neighbor spent many $$ on vet bills after his dog got into trash at a construction site. The workers had tossed a bunch of KFC chicken bones out on the ground. There was no malice intended on their part, but it isn't their responsibility to do what's best for your dog. If you've got a dog hater in the neighbor hood, malice might be intended.