NAVLE（北美执业兽医考题）Day 592

A middle-aged female spayed dachshund presented with polydipsia and polyuria but otherwise healthy with no fever. Examination reveals a distended abdomen with thin skin and alopecia. Which one of the following choices is the most likely suspected diagnosis？

一只中年雌性已绝育腊肠犬由于多饮多尿前来就诊，并且没有明显发烧或者其它症状。体格检查发现其腹围膨大，皮肤变薄以及脱毛。以下哪个选项是最可能怀疑的诊断？