I have a friend who was a missionary in Russia for seven years. He routinely defended himself against dogs with a pocket knife.
I have a friend who was a missionary in Russia. He was told to immediately buy a bicycle chain and keep it up his selieve. He used it on human predators several times.
I had to use a 12 ga shotgun on two vicious dogs many years ago. I found the “birdshot because buckshot has too much penetration” to not cut it. I emptied the shotgun with no effect on them, and then used a .22 pistol.
I now keep the house gun loaded with 00 buck.