have you spoken to your neighbors about their dogs getting out and attempting to attack yours? be cordial of course. if your not you'll look like a loon.
heres my scary dog story...tho i think my dog might have been the scary one lol
My 2nd shih tzu was a very headstrong tough lil man. Of course he thought he was a bull mastiff but the fact was he was all of a heaping 10-12lbs. He one day was just playing in our yard when my neighbors rotties came out (2 of em) barking at him. well Charlie had just about enough of it and he went CHARGING full speed at these dogs who had at least like 60lbs on him. well of course the rottie was wth is this runt doing and picked him up by the back and swished him about. i just about flipped but by the time i got there the deed had been done. and my lil charlie was slowly crawling over to me.
we took him to the vet he just needed a lil cleaning up and TLC. needless to mention he NEVER did anything of the sort again!!
best of luck to you with your situation.