A 4-year-old neutered male Yorkshire terrier dog, that had recently been adopted, was presented for evaluation of PU/PD. Urinalysis showed inappropriate SG (1.019). Physical examination, CBC, serum biochemistry, urine culture, abdominal radiographs, and ACTH stimulation test were normal. However, pre-and post-prandial bile acids were elevated at 31.4 and 99.7, respectively