Physical Characteristics Weight is sexually dimorphic in this species with females weighing on average 16 grams and males weighing on average 19 grams. Head and body length ranges from 70 to 120 mm, and tail length is approximately 55 to 130 mm.
Coloration is buffy to grayish on the back and sides with white underparts.
The feet are also usually white and the tail is either brownish or grayish. The genus Sminthopsis can be differentiated from other marsupial mice by skull and dentition features. The pads on the feet are striated and the hind part of the soles lack pads. Narrow-footed marsupial mice have a relatively well developed pouch for a dasyurid. They have also been known to eat small vertebrates like lizards and mice.