Thank the Lord I had seen a youtube video about two weeks prior that showed how to stop a dogfight.
I recommend it to ALL, because you never know when you might need to use the method described.
Here's the link. I had to use this and it worked.
I managed to save my boy, although he had to have five stitches. The neighbor paid the nearly $300 vet bill, since his animal, by law, was supposed to be tied or penned up and wasn't.
Protecting yourself or others is also covered in some videos, which you can browse at YT. You never know when some vicious dog may suddenly appear.