Spurdog, also known as dogfish, are small sharks commonly found in the northern hemisphere. They are known for their spiny fins and tough skin. However, there are several synonyms for spurdog used interchangeably in different parts of the world. In the United States, they are often called sand sharks, while in Australia, they go by the name flake or gummy shark. In England, they are referred to as spiny dogfish, while in Scandinavia, they are known as spurdogs. Other synonyms for spurdog include rock salmon and huss. Regardless of the name, spurdogs continue to be a popular catch for commercial and recreational fishermen alike.