The Hottest Dog is an item exclusive to the Nintendo Switch remake of Paper Mario: The Thousand-Year Door. It is the only recipe to be added to the remake, and is made by giving Zess T. a Hot Dog and some Hot Sauce. When used, the Hottest Dog will restore 7 HP and FP while also giving the user the Charge status. After completing the Ratooey Businessman's trouble, he hints towards this item by mentioning that his new product—the Hottest Dog, a combination of his Hot Sauce and Mr. Hoggle's Hot Dogs—was canceled.
In the original game, the businessman mentions combining Hot Dogs with Hot Sauce to create a Hottest Dog, but attempting this recipe results in a Mistake. In English localizations, he instead refers to combining his Hot Sauce with "Fat Dogs", an unobtainable item, presumably to avoid hinting at a nonexistent recipe. This change was undone for the remake. The original English localization additionally called the Hottest Dog a "Tongue-Blistering Fat Dog".