Have you tried talking to your neighbors? Perhaps they did not realize the dog was able to get under the fence, and it was just an accident that the dog escaped. Dogs do escape by accident every now and then.
However, after the police were called the neighbors should now know that their dog can get loose and should take appropriate measures to fix the fence/shorten the tether so it cannot wander onto your property. If it happens again, I think you should try speaking with your neighbors about it, first. If they still don't make changes, you should begin calling animal control/police every time the dog escapes and gets onto your property. Likely, your neighbors will be fined, and hopefully they'll get tired of that.
You really shouldn't have to carry defensive devices in your own yard, but things like bear spray or a cattle prod may offer some additional protection. They will hurt the dog, but I think if its escaping and chasing you through your own property its probably necessary. I really hope your neighbors fix the issue and you don't have to resort to that.
However, after the police were called the neighbors should now know that their dog can get loose and should take appropriate measures to fix the fence/shorten the tether so it cannot wander onto your property. If it happens again, I think you should try speaking with your neighbors about it, first. If they still don't make changes, you should begin calling animal control/police every time the dog escapes and gets onto your property. Likely, your neighbors will be fined, and hopefully they'll get tired of that.
You really shouldn't have to carry defensive devices in your own yard, but things like bear spray or a cattle prod may offer some additional protection. They will hurt the dog, but I think if its escaping and chasing you through your own property its probably necessary. I really hope your neighbors fix the issue and you don't have to resort to that.