Introduction to the divine gatekeeper dog: After more than ten steps into the dry cave, when I looked back at the entrance of the cave, I saw a very real divine gatekeeper dog. It is said that Emperor Zhenwu was attracted by the beautiful scenery of this cave on his way back to Wudang Mountain, so he preached in the cave. In order to prevent the intrusion of demons, a special divine dog was sent to wait at the entrance of the cave.