It's really tough to stop a dog from barking. Vallis is a barker. Adele usually only barks when another dog is barking, so before we got Vallis she was pretty quiet. Vallis barks at anything, so often now they both start barking outdoors.

My "solution" is to just bring them inside when they are loud. They can't have fun outside if they can't be mostly quiet. If they come when I call, I reward them- they aren't going to connect the barking with the good dog unless I actually say "good dog" while they are barking.

Vallis has gotten slightly better about barking since we got him. He used to bark for EVERYTHING, but we ignored his indoor barks when it was for attention and they have stopped. He is still obnoxious outside though. I just bring them in if they can't be quiet because it's not fun to listen to and I try to be a considerate neighbor.