The dog caused Mister Grogan a lot of trouble, but also provided many stories for his newspaper articles.

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And "Dog" Is also a morpheme, but not always because there are single morphemes and then there are words that are composed of many morphemes.

狗"也是一个语素,但词和语素并不总是相同,因为语素是独立的,但词却可以由很多语素组成

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I also got a dog by it being thrown into a car.

有人把狗扔进我的车里，我就这样有了一只狗。

大城市是否危险？ - SpeakingMax英语口语达人