Nowadays many people like to have dogs as their pets. Dogs are friends of man not only because they are lovely but also because they are faithful to their masters.

　　Dogs can do a lot of work for man. They play with us. They hunt with us. They keep door for us. But long ago, dogs all over the world were wild.

　　Dogs can date back to the Stone Age. All dogs have the same ancestor. It is believed that their ancestor was much like a wolf. Other animals, such as the fox, came from this ancestor, too. Hundreds of thousands of years ago, man began to tame wild dogs. After the dogs were tamed, they were trained. The strong dogs became working animals. They were trained to pull heavy loads. They learned to keep an eye on the sheep and other animals. Working dogs had other jobs, too.

　　Some dogs were not strong. But they could help man hunt for game. Other dogs were best as pets.

　　Today, there are more than 100 kinds of dogs in the world.

現(xiàn)在很多人喜歡養(yǎng)狗作為他們的寵物。狗是人的朋友,不僅因?yàn)樗鼈兛蓯?ài),還因?yàn)樗麄儗?duì)他們的主人忠心耿耿。
狗能做很多工作的人。他們玩我們。他們捕獵。他們?yōu)槲覀儽３珠T。但是很久以前,狗在世界各地野生。
狗可以追溯到石器時(shí)代。所有的狗都有相同的祖先。相信他們的祖先是狼一樣。其他動(dòng)物,如狐貍,來(lái)自這位祖先。數(shù)十萬(wàn)年前,男人開(kāi)始馴服野狗。狗被馴服后,他們的訓(xùn)練。強(qiáng)烈的狗成為動(dòng)物工作。他們訓(xùn)練把沉重的負(fù)荷。他們學(xué)會(huì)了照看羊和其他動(dòng)物。工作犬也有其他工作。
有些狗并不強(qiáng)烈。但是他們可以幫助男人尋找游戲。其他的狗是的寵物。
今天,有超過(guò)100種的狗。