Swift Fox, Vulpes velox, adult with young. This is a den in short grass and short sage in southern Wyoming. They are a small light orange-tan fox around the size of a domestic cat found in the western grasslands of North America, such as Montana, Colorado, New Mexico, Oklahoma and Texas. It also lives in Manitoba, Saskatchewan and Alberta in Canada, where it was previously extirpated. they weigh only 4-7 lbs. Wyoming in June. USA