Bennett's wallabies are sexually dimorphic (with two distinct gender forms). Males are larger than females: their shoulders and arms are wider and longer, and they grow approximately twice as fast as females. Females are generally lighter in color. They are covered with coarse, thick, tawny-gray fur on their body. The fur on the nape of their neck and shoulders is reddish. They have well-muscled hind legs and muscular tails that they use for balance while hopping or as a "third leg" while sitting. Females have well-developed frontal pouches for carrying developing young. Their muzzles, paws, and largest toes are black. They have a white stripe on their upper lip.

Bennett's wallabies have a stable population in their range. However, they are sometimes killed as an agricultural pest and are hunted for their meat. They are considered a pest species in New Zealand since they are not native there but rather are introduced.