This rodent is recorded in montane moist forest in Papua New Guinea's Central Cordillera. HMW lists secondary and degraded forest, and describes its tail as shorter than that of the highland form of M. rufescens.
HMW describes M. dollmani as similar in appearance to the highland form gracilis of M. rufescens, but with a shorter tail.
HMW records the species in montane tropical moist forest, including secondary and degraded forest at 1,200–1,525 m. It describes the species as terrestrial and arboreal.
An extinction-risk assessment has not been added yet.