It's #NationalHotDogDay! And it's sparking one of the greatest food debates: Is the hot dog a sandwich? During Memorial Day weekend, Merriam-Webster proclaimed that the hot dog is in fact a sandwich. Memorial Day or National Hot Dog Day, critics continue to reject what they would call an "absurd" premise. What do you think? VOTE #TeamSANDWICH or #TeamHOTDOG.