NAVLE® Question of the day

A nine-year-old female spayed German Shepherd is presented for vomiting, profuse bloody diarrhea, and collapse.

Physical examination reveals severe abdominal pain, tachycardia, pale mucous membranes, poor pulse quality, and tachypnea.

The dog is stabilized with intravenous fluid therapy, and an abdominal radiograph is shown below. The second image reveals the findings on exploratory laparotomy.

What is the most likely diagnosis?

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