The robotic cat can wag its tail.(那只機器貓能搖尾巴。)

The dog gave a wag of its tail.(那條狗擺了擺尾巴。)

When a dog is happy, it will wag its tail.(狗狗高興的時候會搖尾巴。)

Every time I go home, it will wag its tail to me.(每次我回到家，它就會朝我搖尾巴。)

You can buy a pretty good dog with a lot of money, but you can't buy the wag of its tail.(你可以花大筆錢買一條漂亮的狗，可是你買不到狗兒搖動的尾巴。)

It is as though instead of a dog wagging its tail the tail should wag the dog.(這情況恰似尾巴倒過來搖狗而不是狗搖尾巴了。)

Well, then, 'the Cat went on,' you see, a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry.(“好，那么，”貓接著說，“你知道，狗生氣時就叫，高興時就搖尾巴，可是我，卻是高興時就叫，生氣時就搖尾巴。”)

Money will buy you a fine dog, but only love can make it wag its tail.(有錢就能買只可愛的狗，但是有愛才能讓它對你搖尾巴。)

Why does a dog wag its tail?(狗為什么要搖尾巴？)