A five year local buffalo breed was brought to the Consultant Veterinary Teaching Hospital, College of Veterinary Medicine, University of Basrah, Iraq, with a patients history of swelling, pain and redness of the udder with coldness, blue black coloration, fluid exudation, and crepitating were detected on one quarter area. Moreover, edematous fluid was extended to the belly of the diseased buffalo. In addition, milk of the diseased buffalo were watery in its consistency with light red or deep pink color. Gangrenous mastitis was clinically diagnosed on the basis of clinical features caused by Proteus mirabilis which isolated on blood agar with its specific swarm forming character and confirmed by the VITEK system diagnosis on the basis of laboratory features. It has been concluded that the microorganism Proteus mirabilis could cause gangrenous mastitis in the local buffalo breed. Therefore, it needs more attention for prophylactic measure.
 

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