Patient was sent to referral facility for further evaluation of diarrhea and decreased appetite. On admission, patient was more pyrexic at 104.7, with pink, tacky mucous membranes, and had a gassy abdomen. Patient was placed on intravenous fluid therapy pending an abdominal ultrasound with possible exploratory surgery to follow. Patient underwent exploratory surgery with resection, anastomosis, and biopsies. Biopsy of ileocecal mass revealed severe, chronic-active, ulcerative, pyogranulomatous, transmural enterocecolitis. Results from mesenteric lymph node biopsy, which contained a portion of pancreas attached to it found, necrotizing pyogranulomatous lymphadenitis of both samples; most consistent with FIP. A week post-op, patient was doing poorly, was still pyrexic at 104.2, and experiencing weight loss, however, incision was healing well. Patient was discharged with a course of antibiotics, only to return several days later to be euthanized due to poor quality of life.