Right before Gao Zhang died, he regretted a lot of things. The one he regretted the most was abandoning his puppy. After being reborn, he decided that he was going to protect Da Huang, his new puppy. Turns out, Da Huang is a descendant of the Dog God! One of the great benefits of being a dog god descendant is cultivation! But the Dog God's practice cannot be passed on to outsiders. If you want to cultivate, you must be married to a descendant first.