Move his potty area.
Woolf(GSD) is DA. Shadow(Lab) is a typical Lab - social, everyone-dog and human- is a friend. The previous neighbors had untrained beagles and a king of the mountain chi, the new neighbors have untrained mophead fuzz balls. Both sets of dogs charge the fence barking as soon as we open the backdoor. Neighbors have been useless controlling their dogs.
Woolf, we expected problems from and used the neighbor dogs as training. Shadow is now reactive ONLY to the neighbor dogs. She is like us - sick and tired of being barked at <sigh>. So now we are working with Shadow on ignoring the dogs.
There is a privacy fence up and we have installed the welded wire fence 2/3 ft inside that to prevent the nose to nose. Made a huge difference.