A 3 year old Maine Anjou/ Angus cross bull presented for evaluation of a swelling on the right lower jaw. The mass was first noticed 3 months ago and was small. The bull had since been turned out with cows and the owner had noted that the mass would vary in size. The bull weighed 2000 lbs. On physical examination the mass was located on the ventrolateral aspect of the right half of the mandible. The mass was approximately 10 inches in size, non-movable, and had an ulcerated surface. At oral digital examination, several of the right mandibular teeth were loose. The mass could be felt to bulge from the gingiva. Mucopurulent exudate was evident from the oral cavity and the ulcerated surface of the mass. Radiographs were taken to evaluate the extent of bone involvement.