The main difference between kosher style hot dogs and regular hot dogs is that kosher style hot dogs are made with ingredients that are permissible under Jewish dietary laws, while regular hot dogs do not. This means that kosher style hot dogs—which can be made of beef or chicken, but never pork—must have a certain percentage of meat in them; they must be prepared according to strict rules regarding what kinds of utensils are used (no mixing meat and milk!) in order to be considered kosher. You’ll often see them served on rolls or buns, with mustard on top for dipping purposes.