Winter foxes or white foxes

The white fox is found throughout the temperate highlands and northern plains of Middle-earth.

Actually only white in winter, the white fox's dense pelt is normally a bright, silvery grey. The long hairs readily pick up grass pollen, often causing it, like the Grass Cats to appear to be a strange light green in color. Even during the winter, the coat is adorned with black-tipped guard hairs that lend it silvery gleam, so the fox is hardly ever really white.

White foxes live in shallow burrows and dine on small mammals, birds (especially ground birds), and their eggs, as well as substantial quantities of large insects, such as grasshoppers.