Erlang Shen’s dog is called Roaring Sky Dog because it is so powerful that it can roar into the sky and shock the world. The Roaring Sky Dog is an image in ancient Chinese mythology. It is the magic weapon beside Erlang God, assisting him in hunting and charging, and killing demons. Its prototype is a white short-haired dog. The Roaring Sky Dog is white and describes Its appearance is that of a dog with a white capillary waist.

Every time Yang Jian lets the Roaring Dog go, the word he uses in the book is "sacrifice the Roaring Dog". The so-called "sacrifice" is usually A kind of magic weapon, it is suggested that this Roaring Sky Dog can be carried around, and when it is used, it is sacrificed.