The greater mouse deer’s body length is 70-75 cm while its weight is 5-8 kg. Rather than horns or antlers, the male has a set of elongated upper canines or tusks that protrude from the sides of the mouth like fangs. The female larger Malay mouse deer has the potential to be pregnant throughout her adult life, often having just 1-2 hours to catch her breath between giving birth and becoming pregnant again.
Larger Malay mouse deer are nocturnal, and hence rarely seen. Extremely territorial by nature, both sexes of larger Malay mouse deer regularly mark their territories with urine, faeces, and secretions from an intermandibular gland under the chin. When agitated, larger Malay mouse deer drum on the ground with their hoofs at 4 times per second. Their diet consists of buds, leaves, fruit, and probably small amounts of animal food.