To describe the clinical presentation of a dog with fatal hemorrhage from an aortoesophageal fistula (AEF) immediately following endoscopic removal of an osseous esophageal foreign body.

中文翻译：

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内窥镜辅助犬食管异物清除后，从主动脉食管瘘致死性急性出血。

描述内镜下取下食管骨性异物后立即发生主动脉食管瘘（AEF）致命出血的狗的临床表现。