一本名为《狗狗是怎么一回事》（How Dogs Work）的书中，作者给出了这样的结论：本质上，“玩耍”仅仅是动物的成长发育方式的意外产物。
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how dogs work
狗是如何工作的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Listen to the dogs cry. How they hated the work. They were off.
VOA: special.2010.02.27
Beltz and some of the handlers he is training alongside the dogs demonstrated for CNN how the dogs work.
CNN: Are dogs the key to bomb detection at airports?
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