朋友，作为词组，应该是
lucky dog
幸运儿
Wow, really? He was always a lucky dog. Both of us were very naughty, but every time he got excuses to avoid the punishment.
真的？他一直以来都很幸运呢。小的时候，我们都很调皮，但是每次他都能够免于处罚。
Likai, you are a lucky dog!
李凯，你真是个幸运儿啊！
It is really bad. But in other word, you are a lucky dog.
这确实倒霉，但换句话说，你又是幸运的。
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