Regarding protection
The one who attacks first is usually weaker, because attacking gives an advantage, and it's used by those who can't take damage.
Meanwhile, the concept of self-defense is insignificant. Like, if someone "bad" defended themselves, they deserve a beating. If someone "good" attacked, they did everything right, and we won't punish them. In fact, this is exactly how things have been done throughout history. If a dog bites a "r" word, it won't get in trouble; if a "r" word kills a dog, he'll go to jail.
Self-defense is only relevant in the 1% of cases when you don't know someone is a threat. For example, it's clear that stray dogs will form a pack and attack a person, but you can't shoot them beforehand, because humanism...
And yes, one of the things I wouldn't have created in the creation of the world is dogs. An animal almost as disgusting as a mosquito. Only sometimes they try to be your friend. Something from a horror movie