A chili dog is a hot dog that is served topped with chili con carne. Often, other toppings are also added, such as cheese, onions, and mustard. One popular variety of chili dog is the Coney dog, which ironically originally came from Michigan and not Brooklyn. A Coney dog is a hot dog piled high with chili, onions and mustard. A Michigan dog is similar to a Coney, as is a Texas chili dog, which is ironically from Pennsylvania.