They are thought to mark territorial boundaries by urinating on objects at regular places. Territory sizes vary according to fox population densities and the abundance of food. Where red fox are abundant, it appears that territories overlap and in some areas seem to be shared by two or even three different family units. In rare instances, communal denning does occur, with more than one female with her litter sharing the same den. Under good habitat conditions most fox territories will be about 2 or 3 square miles, although, if hunting conditions are good, most fox will stay within a square mile daily, especially in mild weather.
Coyotes persecute red fox.
Coyotes dominate the better territories where the two species are both found. Red fox move when coyotes are present. Juvenile red fox begin to wander from family units during August and September. Significant dispersal's occur during the months of November , December and January as young fox seek their own territories and mates. Many older red fox who have lost mates also seek new mates.