Although the canine vaccine for rabies is commonly used for "pet" foxes (and I use that term very loosely, as they're not meant to be pets), local regulation will determine whether or not animal control will accept the vaccination. If your fox bites sometimes, and local regulations do not accept it, your fox will be destroyed to be tested for rabies.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry