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This study was performed to report the outbreaks of canine intestinal spirochetosis and to characterize the canine isolates. Three canine isolates were weakly beta-hemolytic and had sharp end shape with 5 flagella. Isolates didn't produce indole but fermented fructose. In API-ZYM ? study, isolates were alpha-glucosidase negative and alpha-galactosidase positive, which is the typical characteristics of B. pilosicoli. In multilocus enzyme electrophoresis(MEE) study, isolates were divided into 2 electrophoretic types. Isolates showed different properties with B. hyodysenteriae but closely related with pathogenic canine intestinal spirochete(B. pilosicoli ). This is the first report of the isolation and characterization of canine intestinal spirochete in Korean dogs.