Will Falconer, DVM Moderator
Oh, this is pure brilliance! And please read this article to learn that, when your titer does run low, it does NOT mean immunity is no longer present. Here's another I wrote specifically about rabies immunity: a serious eye opener!
Knowing this will further empower you to help your Haily. Bravo, and someone needs to get a rifle to that rabid fox, without further delay (though, if it's truly rabid, it shouldn't live beyond 10 days after the first bite incident).