Here are some examples:
* Europe: Red fox, Arctic fox, Fennec fox, Corsac fox
* Asia: Red fox, Arctic fox, Fennec fox, Bengal fox, Tibetan fox
* North America: Red fox, Arctic fox, Gray fox, Kit fox
* Africa: Fennec fox, Cape fox, Bat-eared fox
* Australia: The Australian red fox (an introduced species)
To be more specific, you'd need to tell me which species of fox you're interested in.