“see a man about a dog”别理解成“见一个和狗相关的人”，其正确的含义是不解释而离开，出去一下（尤指上厕所的隐晦说法）。

【例句】
I don't know where Tom went. He said he had to see a man about a dog.
我不知道汤姆去哪里了，他说他出去一下。

Fred went to see a man about a dog. I hope he remembers to put the seat down.
弗莱德出去上厕所了，我希望他记得把放下洗手间马桶的座垫。