Taxonomic Disputes
There is some debate in the scientific community regarding speciation between the other subspecies of raccoon dog and the Japanese subspecies in that due to chromosomal, behavioral, and weight differences, the Japanese raccoon dog could be considered a separate species (i.e. Nyctereutes viverrinus rather than N. procyonoides viverrinus).
Genetic analysis has confirmed unique sequences of mtDNA, classifying the Japanese raccoon dog as a distinct isolation species, based on evidence of eight Robertsonian translocations. The International Union for Conservation of Nature Canid Group's Canid Biology and Conservation Conference in September 2001 rejected the classification of the Japanese raccoon dog as a separate species, but its status is still disputed, based on its elastic genome.
A not necessarily mutually exclusive position advanced by some researchers is that raccoon dogs of Japan could be further divisible into separate subspecies as N. p. procyonoides (hondo-tanuki) and N. p. albus (ezo-tanuki).
Read more about this topic: Japanese Raccoon Dog