TexasCHLforum.com

Were I a witness, I can't say what I'd do, unless the dog actively went for another target. Then, it'd be dead.

If the dog went after one of my pets, either in my own yard or while I was out with that pet, it'd be dead. Period. I went after a rottweiler that attempted to attack one of my cats in my own backyard about eight or nine years ago; it only survived because it ran faster than I could. His owners were quite surprised at the young teen who chewed them out for allowing the dog to roam, and who threatened to kill the animal if it ever entered my yard again.
I give 'em credit, that dog was never allowed out without a leash again.
(BTW, that dog had a history of doing this - it attempted to "run off" and intimidate my father, in his own front yard a week or two before this incident, and had been aggressive with others as well.)