Why do dogs protect their owners when they are timid?

This is the most faithful side of a dog. Dogs are usually very protective of their owners. Although they may be timid themselves, they can do anything for their master. Although you may be greedy and lazy at home at ordinary times, as long as someone hurts your master, it will definitely rush ahead. My dog is also very timid. I have been bitten by a dog since I was a child, and I dare not talk back. But if a big dog comes near me, it will try to stop in front of me. In fact, it is also afraid, but it puts the safety of its owner first in its heart. Our family often pretends to fight and quarrel to see how it reacts. I pretended to pat my parents or be a little aggressive, and it immediately stood in the middle and shouted, don't let us fight. But if my parents pretend to pat me, it will come screaming and even stand up and pat my parents with its claws. For him, everyone is the master, but in a pinch, he will protect the person who is most loyal to him.