Two ways I know to fuck a dog up.

The first, and least destructive, kick it very hard in the nose. Dogs have super sensitive noses.

The second, more brutal, but appropriate given what this dog is doing. Grab both front or back legs and pull them both left and right violently. Dogs legs aren't built to bend that way and it will snap em like twigs.

Of course the second method has a higher chance of you getting bitten and latched onto if you go for the front legs... Something you don't want with a pit bull's lock jaw.

There's a chance of the same issue with a nose kick, but it will stop the dog dead.

A kick to the balls would do it as well man... I think you've got the right idea.

I was attacked by a dog as a kid, and chased by a local feral many times. I've zero tolerance for badly trained violent dogs, and it's got me in trouble with obnoxious owners and police before now. I usually find if the dog is violent, the owner is too and it often comes to blows. But I refuse to watch someone being terrorised by a violent dog just because it's owner is a dickhead who doesn't know how to Train and look after an animal with love and care.