In about 15 US states, it is legal to own native species of foxes as a pets. Exotic foxes may have different rules. While a fox may look like a cute pet, there's a difference between a socialized animal and a domesticated animal. There are two pretty good online discussions by long-term fox owners.
Bottom line: they are very noisy, often smelly, and are prone to bouts of insanity. There are good ones, but plenty of not good ones, according to one owner.
Image: YouTube / Stanley "Dirt Monkey" Genadek