A 5-year-old, male Labrador Retriever is brought to the referral clinic by his owner for evaluation. The family had recently returned from a camping trip, and several days later the dog became lethargic, vomited a few times, and had soft stools. He was weak and had not eaten any food for more than 24 hours. The referring veterinarian had given a single dose of antibiotic (type unknown) and subcutaneous lactated Ringer's solution, but there had been no improvement.
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