In Texas deadly force is authorized in defence of your property. If the guy gets a good lawyer he will do just fine. His dog, his propety, and he was in fear for his life. Did you think the guy was going to stop with the labrador? Dont over simplify things. He enterd the property with the intent to attack. the dog defended the attack until the owner could defend the home/his health. If you are on my lawn beating my dog you are in deep shit. What is the big deal?
Ps : Viper, my chocolate Lab was knocking my 2 year old son down in the back yard repeatedly, and he was telling her bad dog! Well, I went out there to the corner of th yard to scold her, but before I did I realized that he was trying to get close enough to play with a new ant hill mound, and she was keeping him away from it. God I love that dog.