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.
现在很多人喜欢养狗作为他们的宠物。狗是人的朋友,不仅因为它们可爱,还因为他们对他们的主人忠心耿耿。
狗能做很多工作的人。他们玩我们。他们捕猎。他们为我们保持门。但是很久以前,狗在世界各地野生。
狗可以追溯到石器时代。所有的狗都有相同的祖先。相信他们的祖先是狼一样。其他动物,如狐狸,来自这位祖先。数十万年前,男人开始驯服野狗。狗被驯服后,他们的训练。强烈的狗成为动物工作。他们训练把沉重的负荷。他们开云kaiyun(中国)会了照看羊和其他动物。工作犬也有其他工作。
有些狗并不强烈。但是他们可以帮助男人寻找游戏。其他的狗是的宠物。
今天,有超过100种的狗。
