Case just about like that one happened to me while I was walking my dogs. Saw a lady coming my way on the other side of the street with a dog she was having a hard time keeping under control. I kept mine in check and passed by.
Didn’t go 10 yards when I heard her holler and saw her dog out of the corner of my eye coming up on my Black & Tan.
B&T was game and fight on. Took a bit to get them apart but I think mine got the best of it.
There are about 3 ladies in the neighborhood who walk large dogs they can’t control. Now, most of the time I take a side street to go around them.
Then there’s the flip side. Friend of mine used to raise and train Irish Wolfhounds. She lived in a bad neighborhood.
One day walking her dog with her, some gangbanger thought it would be fun to sick hit pitbull on her very well behaved Wolfhound. Idiot. When the pitbull charged, she had enough time to warn the banger to call it off. Once. He laughed, so she gave the “attack” command.
Patientiently sitting Wolfhound lept at the pitbull and broke its back with one swipe of a truly massive paw. Dead before it hit the ground. Wolfhound calmly returned to her.
Banger went nuts, of course. That is, until the Wolfhound let loose a truly phenomenal growl. About made me pizz my pants, and I wasn’t the target. Pretty sure the banger did.
We calmly walked off. She moved not long after that. (This was 20 years ago.)
She really did have that dog well trained.
PS Biggest problem with that dog is that it thought it was still a puppy sized lapdog. Ooof.