I Need Advice On What To Do

My neighbor has a pack (3 to 5, they escape so the number changes) of German Shepard's in his backyard that he spends no time with. He lets them out whenever he wants to let them run around his front yard, but they don't stay in his yard they go all over the neighborhood. Because he spends no time with them they don't respond to commands and when I walk my dogs they race up and try to fight. Given how many and how big they are this is terrifying. What do I do? Stop walking my dogs, which is not okay? This is a scary situation. Please advise.