Foxes tend to live in dens, so all they really need to do is dig, they don't need anything.
they dig tunnels in the snow
Red foxes dig a shelter consisting of an extensive burrow.
a fox makes single footprint
A fox shelter may be called a fox den or fox burrow. This is where foxes seek protection and safety, especially during periods of rest or when caring for their young.
den
a snowy cave with lots of rocks
The Arctic fox lives in burrows on the side of hills. During blizzards it may tunnel into snow to create a shelter.
The arctic fox lives in burrows on the side of hills. During blizzards it may tunnel into snow to create a shelter.
As burrowing animals, they are known to dig tunnels fifteen feet or more in which two to five pups are reared
The Arctic fox has an extensive burrow and seeks shelter there. Some call it a den or a lair or an earth.
in wigwams
in a den that is dug in the ground