Oh, sure, now you made me go look for information because I might easily have misremembered. On the plus side, I already knew where to look. Here, scrolling down. It doesn't seem to say specifically raising since birth, but it does link to a particular anecdotal story about a young cub raised in a home. Doesn't seem to mention house-breaking, either...dunno. Still not a good idea, it seems. Dogs took generations of systematic breeding for domestication, and you might get lucky with a fox that's calm enough with it, but you probably won't.