The Amazon weasel is 43 to 52 cm (17 to 20 in) in length. Its tail is 16 to 21 cm (6.3 to 8.3 in) long. They have a long, slender, torso and short legs and ears. They have short fur. It is reddish to dark brown on the upper body, and is pale orange-tan on the underparts. The whiskers are short and there is almost no hair on the bottom of the feet.