When I was a teen, I used to walk my dog (75 lb Weimaraner) in my neighborhood. I had no option, but to walk past several homes with unleashed dogs. Two were miniture poodles; they would always come out into the street yapping in front of us as we passed the house, with my dog pulling hard on the leash, and them just outside the leash range.
In separate instances, both of those dogs stupidly did the same thing as usual, but my dog had learned a trick. He heeled near me just as we got to the edge of the property, so as to get slack on the 8’ leash, and then pounced when the dog got within range. I knew what he was about to do, but had no time to gather the leash to prevent him from pouncing on them. In an instant, he had the dog on the ground with his jaws around its neck. One bit my hand (thankfully gloved, only leaving a large bruise, though tooth holes in the leather) as I was removing my dog’s jaws from it’s neck. Both survivied without life-threatening injuries.
The other home had two German Shepards. That, too, was easily resolved by my dog. In that incident the owner was in the front yard when his dogs crossed the street to confront my dog. I told him to get his dogs. He told me let them work it out. I told him, you really need to get your dogs back on your property. He refused, again stated let them work it out. He obviously, foolishly, believed his two dogs could beat my dog. I then let go of the leash. I was not going to disadvantage my dog in a fight with two large dogs.
My dog ran at the closest one, reared-up on his hind legs and swatted it across the street. He then immediately pounced on the second one and instantly had its neck in his jaws and on the ground. The neighbor started yelling at me to get my dog off of his dog. I said, I thought you wanted them to work it out? I told him to get his dogs. When he retrieved the first dog, I pulled my dog off the other, and it ran off. That resolved that problem.
My dog would play-fight with my other dog (which had passed before these incidents) and a next door neighbor’s dog in my back yard, and he would do exactly to them what he did with those German Shepards. I had never seen any of my dogs, or any other dogs, for that matter, rear-up and swat like a bear, until this one. He would send my other dog that was much bigger than him about a dozen feet with a swat of his front foot, and then pounce on the other. He apparently had a very good fighting instinct and learned well how to fight more than one at a time.