idioms using names of animals

The day before yesterday, our Friday English Class
teacher gave us a quiz as follows---

all the blanks will be filled with the names of animals.

Why don't you try and enjoy it?

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* Did you fall asleep? No, I just took a little ( ) nap.

[ kitten cat kitty ] （ちょっとまどろんだだけ）

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* I’m not surprised he’s so tired.
He’s been working like a ( ) recently.

[ dog hound pig ]　（なりふりかまわず働いている）

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* We really ( ) out at the barbecue the other day.

[ dogged pigged hounded ] （たくさん食べた）

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* He called me a “( )”—what does that mean?
It means he thinks you are a coward.

[ chicken chick hen ]　（臆病者）

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* You can cry until the ( ) come home.
It won’t change a thing.

[ ducks sheep cows ]　（いつまでも泣くがいいさ）

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We laughed a lot filling many, many blanks.

P.S.

みなさん　こんばんは

解答は　cat, dog, pigged, chicken, cows でした。
先生は「何故その答えになるのか、理由は訊かないで！」
とおっしゃっていました。

(origami--kominkan-matsuri 2011)