My old street was popular with both people walking and people walking their dogs and most of them had a large stick of some sorts. There was a house 3 houses away that did have a couple of large somewhat aggressive dogs that when they got out, they went into the "pack" mentality and would be more aggressive. One of them started to chase me from their yard when I went out to get my mail!
I was always nervous walking our dog even though he is 75 lbs but when we were out and there were other dogs (those dogs) that would bark at him, he would ignore them. He was more interested in making friends with the people he saw then other dogs!
I would say get some mace style spray for dogs and a large solid walking stick. The spray would be to get them from a distance and then the stick of course for if they get too close. Good luck!