Another situation occurred a few days ago in which the pit bull latched onto a man’s hand while he was holding a pizza in that hand (boyfriend of the dog’s owner) and he was able to drag himself and the dog to his firearm box, open it with his free hand, take it out of the box, and fire upon the dog.
It is well that the man with the firearm was available to help defend this woman. I am glad she was not harmed further. He was obviously ready, willing, and able to help. Preparation is the key, as always.
Agreed on preparation. Well said.
Dog Heart - Anatomy of Circulatory System
https://www.dreamstime.com/stock-photo-dog-heart-anatomy-circulatory-system-image50368414
It looks like the spine would be a very difficult target because of likely movement, depth of target and small size of target.
https://4.bp.blogspot.com/_QGEgDSM-Cao/SkHWKfLX95I/AAAAAAAAACc/1YvfIvRDteU/s1600-h/INTERNAL.JPG
Middle of the chest may be much a better target area than the spine, either from the front or underside. A knife might require a fairly hard punch to make it through bone.
More diagrams.
Photo Gallery of - Dog Circulatory System Diagram
http://animalia-life.club/other/dog-circulatory-system-diagram.html
[A reminder to other readers here that this is not about trying to destroy or hurt animals for no reason. The purpose is for those interested to become more educated and prepared for real self-defense if needed.]