1) Three territorys?
Icy/snowy territory for anyone who uses foxes that live in cold areas like artic foxes, desert for foxes like the kit fox and any others that live in the desert. Finally the forest for those that don't live in the hot or cold.
2) Skulk instead of Clan?
Did some research and foxes live in groups called Skulks.
3) Random events?
Keeps everyone moving and it can be anything. Storms, eyes in the night, etc.
To be clear I'm doing some actual fox research and these are ideas that I thought of. Questions are welcome and you can toss in your own ideas to (I'll give you credit for your ideas)