I found lots of cool videos on Arkive.org!
Here are some of the ones I found...
http://www.arkive.org/fennec-fox/vulpes-zerda/video-11.html
http://www.arkive.org/fennec-fox/vulpes-zerda/video-03.html
http://www.arkive.org/red-fox/vulpes-vulpes/video-09b
http://www.arkive.org/red-fox/vulpes-vulpes/video-09c.html
http://www.arkive.org/red-fox/vulpes-vulpes/video-09d.html
http://www.arkive.org/red-fox/vulpes-vulpes/video-09d.html
http://www.arkive.org/arctic-fox/vulpes-lagopus/video-17b.html
http://www.arkive.org/arctic-fox/vulpes-lagopus/video-17a.html
They're all really interesting!
