National Chili Dog Day is celebrated on the last Thursday of July, honoring the spicy hot dog variation known as the chili dog. This unofficial food holiday is observed in the United States, where people indulge in chili dogs topped with chili con carne or similar meat sauces. The chili dog has various regional adaptations, such as the Coney Island hot dog, popular in Michigan, which features a beef sauce over a Vienna sausage. Other notable styles include the cheese coney from Greater Cincinnati, which is topped with Cincinnati chili, and the hot wiener from Rhode Island, served with a seasoned meat sauce. Celebrations often involve enjoying chili dogs at food carts or restaurants, hosting cook-offs, or making them at home with family and friends. Participants frequently share their experiences on social media using the hashtag #NationalChiliDogDay.