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The lesser mouse-deer is found widely across Southeast Asia in Indochina, Myanmar (Kra Isthmus), Brunei, Cambodia, China (Southern Yunnan), Indonesia (Kalimantan, Sumatra and many other small islands), Laos, Malaysia (Peninsular Malaysia, Sarawak and many other small islands), Singapore, Thailand.It is one of the smallest known hoofed mammals, its mature size being as little as 45 cm (18 inches) and 2 kg (4.4 lb) and related to the even smaller Java mouse-deer. It is threatened by predation by feral dogs.

National Geographic