The prototypes of physical characteristics in the breeds of Korean Native dog were reviewed. Sapsaree and Jindo dog were medium sized, but Sapsaree was 5 ㎏ heavier and 6 cm higher than Jindo dog on the average. The dominant coat color of Jindo dog and Chejudo dog was white or yellow, but that of Sapsaree was black or yellow. Sapsaree showed higher degree of variation in the tone of main color than Jindo dog. Most of the medium sized dog breeds in the Far East Asia had erect ears, upward tails and short coat. Jindo dog and Chejudo dog showed those characteristics of them, while Sapsaree had dropped ears and long coat. Appearance frequency of dew claw in Jindo dog and Chejudo dog was different from that in Sapsaree, the former was 4% and the latter was 18.3%. Fluctuations of blood cell number and blood protein contents were reviewed by different conditional variations such as age, sex and coat color in Jindo dog and Sapsaree. Blood types in DEA (dog erythrocyte antigen) system of the dog breeds showed extreme values that were different from the values of the European dogs. Phylogenetic relationships of the Asian dog breeds were compared by using the blood protein polymorphism. Jindo dog, Chejudo dog and Sapsaree showed close relationships among them.