i have to say,i think these people are establishing themselves as very selfish neighbours.they must know the dog barking is waking people at that time of the morning,but,they obviously do not care. if they really cared about their dogs,they would take them for walks like dogs love and need,but they obviously cant be bothered to do that either. they may not be nasty people though,so the first chance you get to see them at the front of the house just be natural and say hello! Play it from there by your intuition!