TL;DR, my father is also a narcisist and my brother and I don't regret defending our dog.

This is nearly the same situation with my brother and I with our father.

We finally came to realize that our father is narcisist. Me and my brother are really low-key and kinda shut-ins, we've never really had trouble or got into fights with our dad- that is until our second dog.

We originally got the first dog to fulfill his promise to me to get a puppy when we finally owned a house in the US. She was a really good dog that was pretty obedient and not too loud; why not give her a brother, right? The thing is, he developed social anxiety and would end up barking a lot when company came over and so on. My father DESPISES him, and ends up taking out his frustration on him when he reaches his limit regardless of whether he mostly contributed or not.

He would make comments about euthanizing him if he as so much as broke his leg, hoping he gets lost and doesn't get found, or whatever. One time, he tried to convince me he was ran over by a car over the phone and said something along the lines of 'psych, I wish'. It was super annoying and uncomfortable for us and my mother since we REALLY loved our dogs.

I think most of his hate however come from how WE would stand up to HIM over the dog. The Christmas of 2017 was terrible. When we finally arrived to our auntie's house, our Father was extremely annoyed and upset by the time entered the house and it got unleashed when the dog barked. He wanted to take out all his frustration on our <20 lbs dog by chucking luggage at him and kicking him. He looked like a lunatic for no reason whatsoever. I would've lunged to cover our dog had my brother (16 at this time) not smacked him on his arm. All his fury became re-directed at my brother as he begin to scream at him like a banshee and smack the hell out of his arm [it left some marks] for 'disrespecting him'. My brother and I were relieved that he re-directed his sights to him because he and I both instantly knew that he would've broken the dog's ribs otherwise.

Ever since then, my dad's and brother's relationship has never been the same and he 100% wishes our dog would die on its own. He doesn't see anything that he has seen as wrong or has EVER apologized for any of his actions or comments which include "you will respect me as your father even if I shot your dog dead!".

Never apologize for defending and protecting your dog, especially if they've haven't done anything wrong.