Hotdog is a countable noun, because hotdog means hot dog, which has both singular and plural forms. Therefore, hotdog is a countable noun, because it has a plural form, and the plural form of hotdog is hotdogs. The example is: Canlhavetwohotdogstotakeout? Can I have two hot dogs to go? Louldsayhotdogsonthestatehighway. I mean eating hot dogs on the highway. Youmusthavesoldalotofhotdogslastnight? You must have sold a lot of hot dogs last night, didn't you?