Signalment: 5 year old yorkshire terrier MN

History: The dog has had a 36 hour history of intermittent vomiting, is anorexic and restless. Prior to this episode the dog has been healthy with no vomiting.

Physical Examination: The dog is tense on abdominal palpation.

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Exactly what kind of creature jumps over the lazy dog and how would you describe it?