Question of the Day

A nine-year-old neutered male Labrador retriever mix with a two-day history of vomiting, salivation and acting drunk is presented.

The dog had several urinary accidents in the house yesterday and seemed to be drinking more, but hasn’t urinated today, and is not eating and drinking today.

During the day, the dog is free to roam outside; he is up to date on vaccines.

The dog is lethargic and very depressed. Physical exam reveals moderate to severe dehydration.

A brief neurological exam reveals ataxia, knuckling, and a slight head tremor.

Which one of the following findings would you expect on testing if your top differential diagnosis is correct?