Depends where in the background. For example if it is fairly close to the top, bottom or one of the sides and stays there you could zoom in and get rid of it that way. To see how much in impacts your video click on the pan/crop button at the end of the event and drag any corner handle in, in the work area, set a key frame. Don't forget set to match outpset aspect ratio and see how it looks. I use this trick a lot to remove logos, time stamps that kind of thing that are always near a corner.

If the hose in more central or simply too close to the fox, try and mask it and track with cookie cutter. Really have to "see" for more specifics.