NAVLE® Question of the day

An eight-month-old male intact German shepherd dog is presented for poor weight gain, chronic diarrhea, and polyphagia.

Fasting serum trypsin-like immunoreactivity (TLI) measurement is < 2.0 µg/L (normal = 5.7-45.2 µg/L).

What is the most likely cause of this dog’s clinical signs?

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