Analysis of mtDNA RFLP for the Korean dog breeds, Sapsaree, Jindo dog and Heterogeneous aboriginal dog (HAD) showed 7 different genotypes which were made by 5 restriction enzymes. Four of them were found in the Sapsaree population. Three genotypes of Sapsaree were also found in Jindo dog and HAD, and one genotype in the Sapsaree population only. The genotypes of the Korean dog breeds had low nucleotide divergency among them was determined to be 0.176% which showed that all the Korean native dogs had a close maternal relationship. Molecular weight of Sapsaree mtDNA was also determined to be 16 kb from the results of restriction map.