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    In English, people use many expressions(表达) with the word "dog". People in the west love their dogs and treat them well. Dogs without owners to care for them lead a very different kind of life: The expression' to lead a dog's life" means living an unhappy life.

    Some people say we live in a dog-eat-dog world. That means many people are competing the same things, like good jobs. They say if a person wants to be successful he has to work like a dog. This means they have to work very hard. Such hard work can make people dog-tired. And, this situation would be even worse if they became ill as a dog.

    Sometimes we should let a sleeping dog lie, which means we'd better not trouble a person who may cause problems. And if someone says you are a lucky dog, he is just saying you're very lucky.

    Still, people say every dog has its day. This means that every person enjoys a successful period during his or her life. To be successful, people Often have to learn new skills(技能) . Yet, some people say that it's always impossible to teach an old dog new skills. They believe that older people do not like to learn new things and will not change the way they do things.

    There are also some other dog expressions. The dog days of summer are the hottest of the year. A rain in summer may cool the weather. But we do not want to have a very heavy rain. In other words, we do not want it to rain cats and dogs.

Topics	Different expressions on dog	.
Life	to lead a dog's life	This means riving an unhappy life.
	a dog-eat-dog world	A situation that people are competing for the same things
work	work like a dog	It means you are very .
	dog-tried	Hard work makes people very tired.
Success& luck	a lucky dog	This means you are very lucky
	Every dog has its day	Everyone will have good luck or success some day in their fives.
	teach an old dog new skills	You  make old people change their ways.
.	the  dog  day  of summer	It happens during the hottest part of the season.
	rain cats and dogs	This means it rains .