One day they fight like cats and dogs. Another day they sing together like lovebirds.

今天两人打得不可开交，第二天就又琴瑟和鸣。

They include pets, like cats and dogs, working animals and farm animals, like cows and sheep.

它们包括如猫和狗这样的宠物，还有如牛和羊这样的役用动物和农场动物。

One day they fight like cats and dogs.

有一天他们像猫狗一样打架。

They're like cat and dog in court.

在法庭上他们针锋相对。

Or are they more like cats and dogs?

或者他们更像猫和狗？

I didn’t get on with her at work either – we fought like cat and dog.

【fight】我和她在工作中也相处不好——我们吵得不可开交。

Now, we all know that in English, there are countable nouns like cat and dog which take an S in the plural form.

现在，我们都知道在英语中，像 cat 和 dog 这样的可数名词复数形式都是加个 S。

When I first started here, he and I would fight like cats and dogs every day, toe-to-toe.

我刚来这里工作时 我们每天就跟猫狗大战似的 针锋相对。

So the birds, a lot of the birds have lost the ability to fly and they nest on the ground, so they're enormously vulnerable to predator species like cats and dogs.

所以，许多鸟类失去了飞翔能力，它们在地上筑巢，因此极易受到猫和狗等天敌的攻击。

I'm sure house pets like cats and dogs maybe they would like to go out sometimes but they have a nice comfortable life inside the house, safe away from harm, things like that so it's a trade off.

我确定的是，像猫和狗等宠物可能有时想去外面玩，不过它们在房子里过着非常舒适的生活，很完全，远离伤害，所以这是一种取舍。