A dog's treasure is a stone-like thing that grows in a dog's stomach. Most of them are spherical or oval, with a general diameter of 1-5cm. The surface is gray-white or gray-black, slightly shiny, with many round-like protrusions. The texture is tight and delicate, and you can see the scratches when you scratch your nails. The cross section is white or milky white, showing concentric annular bedding, which is loose near the center, but cannot be separated. It smells fishy, tastes bitter and powdery, but it doesn't feel sandy when chewed. Traditional Chinese medicine believes that it has the functions of lowering headwind, relieving depression and detoxifying. Indications: fullness of chest ribs, esophageal cancer, gastric cancer, nausea, furuncle, etc. It is an important raw material for many kinds of good medicines. Goubao is a traditional Chinese medicine, which has been called "Three Treasures" together with Niuhuang and Ma Bao since ancient times.