Brucella canis, recognized in 1967 as a cause of canine abortion, is an uncommonly recognized human pathogen. Our patient, a 48 year old man, probably acquired his infection by contact with an infected dog. His clinical course was characterized by intermittent fever and bacteremia over a 4 month interval. His course, which expands the clinical spectrum of human infections due to Br. canis, is discussed in the context of the other reported instances of community and laboratory acquired cases.