Capnocytophaga canimorsus is part of normal gingival flora of dogs and cats. The 
organism can cause septicemia, meningitis, and endocarditis in humans after 
contact with dogs or cats. In spite of the frequency of gastrointestinal 
symptoms in C. canimorsus infection patients, specific gastrointestinal disease 
or clinical images have not been reported. We report a case of C. canimorsus 
bacteremia presenting with acute cholecystitis in elderly woman. She suffered 
from general fatigue and right upper abdominal pain. She had leukocytosis and 
abnormal liver function tests. She showed abnormal findings of the gallbladder 
by abdominal computed tomography and ultrasonography. She was diagnosed with 
acute cholecystitis without gallstones and was administered with antibiotics. 
C. canimorsus was isolated from blood cultures. A history of an insignificant 
wound secondary to a dog bite was elicited. She recovered completely with 
antibiotic treatment. This case revealed that C. canimorsus bacteremia can be 
presented with acute cholecystitis, suggesting that C. canimorsus could cause 
cholecystitis. And this cholecystitis can be treated with antibiotics without 
operation. Physicians seeing patients with acute cholecysitis should ask 
questions regarding animal contact.