Extension Special Series No. 27F
The swift fox is a small nocturnal fox about the size of a large housecat. An adult male weighs about 5-6 pounds and an adult female 4-5 pounds. Their basic coloration resembles the gray fox with a brownish-grey beck, red sides, white undercoat and black-tipped tail and muzzle.
South Dakota State University
Sharps, Jon C. and Service, Cooperative Extension, "Swift Fox" (1979). SDSU Extension Special Series. 114.