Travel Through Time to Become a Dog and Obtain the Big Dog System

(Time travel, cultivating immortality, abstract) I, Wang Ergou, have traveled through time. Others have traveled through time as Long Aotian, so why am I just a dog? He was even taken away, pushed to the ground and made into a contract, and someone wanted to forcibly marry his master! How can I agree to this? Wait, the opponent is half-stepping the golden elixir, and I am building the foundation? Forget it, let me try this big dog system. With the system, I can be the king of dogs even if I am a dog!