Robert Cabral has a video on the proper technique

https://www.youtube.com/live/rHVyMHTb6l4?si=ZPkPtNP8_zcb_MIf

It doesn't work when a dog really doesn't want to let go. I think it would even make it bite stronger.

By the way, good luck sticking your finger in a dog but when he is fighting... I think you didn't try it much before giving advices.

I've seen the video where all these methods were tried to no avail, so I don't have much faith in them. The safest solution is to put the animal down, but of course you have to have something on hand to do that. A 4x2 to the temple should do it. That'll end the aggressor and save the victim.

> finger in the butt

What

You might need something like rebar to stick in the back of the mouth and pull back when that doesn't work