Red foxes, including the silvery form, are one of the most widely distributed carnivorous species in the world, ranging over much of the northern hemisphere and Australia. ĭark colour in the Alaskan silver fox is caused by a mutation to MC1R, while in the standard silver fox the dark colour is caused by a recessive mutation to agouti. The blended offspring of a silver and red fox is known as a cross fox. Occasionally, the colours of mixed foxes blend rather than segregate.

Fiery red parents may occasionally produce a silver cub, the usual proportion being one in four. When one fiery red fox of such a pedigree is mated with a silver one, the litter is almost always 50% silver and 50% red, manifesting as a Mendelian incomplete dominant trait. When mated to pure red foxes, the resulting cubs will be fiery red in overall coat colour, and will have blacker markings on the belly, neck and points than average red foxes. When bred with another member of the same colour morph, silver foxes will produce silver-coated offspring, with little variation in this trend after the third generation. Silver foxes tend to be more cautious than red foxes. The soles of the feet are so thickly covered with woolly hair that no callous spots are visible. There are scarcely any long hairs on the ears, which are thickly clothed with fur.

When viewed individually, the hairs composing the belly fur exhibit a wavy appearance. The fur is shortest on the forehead and limbs, and is finer on the fox's underbelly. It surrounds the whole body even to the tail, where it is a little coarser and woollier. The uniformly blackish brown or chocolate coloured underfur, which is unusually long and dense, measures in some places two inches and is exceedingly fine. The hair is soft, glossy and was once reputed to be finer than that of the pine marten. The hair of the underfur is brown at the base, and silver-grey tipped with black further along the follicle. The silver fox's long outer hair can extend as much as two inches (5.1 cm) beyond the shorter underfur on different parts of the fox's body, particularly under the throat, behind the shoulders, on the sides and the tail.

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