A 7-week-old male Yorkshire terrier is presented with a 2-week history of on and off vomiting and diarrhea that began around the time he was weaned. The owners relate that he seems to "drink and pee a lot." They report pacing, disorientation, weakness, and "stumbling around." Physical exam is unremarkable, but only one testicle has descended. As the puppy explores the room he appears ataxic, stumbles a few times, and bumps his head into the wall. What is the clinical diagnosis?
一只7周龄的雄性约克夏由于其断奶后就开始的断断续续呕吐和腹泻前来就诊。主诉这只狗好像有点多饮多尿，步态异常，定位障碍，虚弱以及走路踉跄。体格检查未见明显异常，不过可见只有一个睾丸下降了。当这只狗在诊室里走路时，出现了共济失调，绊倒了几次，用头抵住墙等情况。你的诊断是什么？
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