It's likely a fennec fox is illegal in your area. If not, then probably in your building. Fennecs require as much socialization and human care as a puppy, their entire lives. They can be destructive, males spray and all fennecs dig wherever they can, including carpet. They are nocturnal by nature as well. Honestly, I think they shouldn't be pets.

STO are like slightly larger gerbils. I don't think one will be as cuddely as you want. They certainly can't be out playing with the dog or ferrets. They have a little more demanding dietary needs than your average rodent pet.

You'll need to also find a vet that treats exotics if you got one, before you got one. This can be more expensive than a dog or cat vet.