imported post
If someone pulls a gun and points it in my general direction, more than likely I would be in fear for my life, and with that I'd be justified under law to use deadly force to defend myself. However, every situation is unique, we can't exactly predict the future.
Assuming I have a dog:
If he shot my dog before I had time to react to him shooting my dog, and the gunshot got my attention, and I turned to see him with a gun, I would be in fear for my life and most likely draw. Assuming I drew my sidearm, either he would point his at me, at which point I would most likely take aim and fire, or he would stand down in some form and I would most likely not shoot. There may be other ways the situation could go. There are too many variables to say for certain either way.
If he drew in my direction and I had time to react before he shot my dog, I'd draw down. If he continued to point toward my direction after I draw, I would most likely fire. If he stood down, I'd most likely not. Once again, too many variables to say for certain either way.
Aside from anything that would put you in fear for your life: Simply based on the fact that it's your personal property being damaged, you would not be justified.
HOWEVER: If it were done in a manner that posed an immediate threat to your life, or posed an immediate threat of great bodily harm to you, then you would be justified.
That's all I can say for now.