Serum proteins of Korean native dogs (Gyeongju DongGyeong dogs) was analyzed by capillary electrophoresis system. Electrophoretic patterns showed six fractions. Total serum protein and ratio of albumin to globulin were $5.99{pm}0.83$ (g/dl) and $1.41{pm}0.29$ (g/dl) in DongGyeong dogs. Relative percentages of total serum albumin and $alpha-1$, $alpha-2$, $eta-1$, $eta-2$, $gamma$-globulin fraction were $57.94{pm}5.43$, $3.15{pm}2.30$, $7.49{pm}4.09$, $9.43{pm}3.50$, $7.63{pm}5.70$, and $14.36{pm}7.63$, respectively. It was observed that $eta$-globulin was higher than other fractions. The most striking alternation with age was founded in the $gamma$-fractions. Also, it was observed that ratios of albumin to globulin in DongGyeong dogs were higher than on other dogs.