Something that works for me MOST of the time is to ride right toward the dog while you yell at it "NO!" or "STAY!" They don't have room to chase you and you are now the aggressor. They usually turn back toward their house. Seems like the little dogs are more of a problem for me than the bigger ones. I think it is because their "parents" think they are so cute so they don't discipline them much...."Oooh, my cute little doggie can't hurt anyone."
As we must account for every idle word, so must we account for every idle silence." ~Benjamin Franklin