"Most states the guy would have been sent to jail as a dog is considered 'property',"
Cite a few.
Every state I'm familiar with - Pennsylvania, Maryland, Virginia - allows an owner of a dog being attacked by another dog to kill the attacking dog to save the dog being attacked.
"Deadly force only applies against persons not property or pets."
Incorrect. A number of states allow the use of deadly force to protect property.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.