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introduction Name: Major: Hydraulic Structure Engineering(水工 结构工程） Graduated: Hefei University of Technology Some thing about dog I‘ve always liked dogs. When I was little，My grandma had raising a wolf-dog, I took it every day to go out and play. I always wanted to keep a dog like it. But I had unable to do it. The dogs role Dogs can help people in many different ways. Most dogs are our friends .They keep us company and protects us from intruders. They alert us if there may be an intruder around. Some dogs help people that are blind or handicapped. Dogs can be trained to be a helper for most jobs or used by the police in rescue works The dogs behavior 1、Happy and Excited A happy dog has its ears perked forward, a relaxed mouth and wagging tail. If excited the dog may also jump up, circle or run around. This can be accompanied by barking or mock growling. 2、Invitation to play When the dog bows down with their front lowered and their rear in the air with tail wagging they are inviting play. 3、 Submissive A submissive dog will roll over onto its back and display its stomach. A contented dog will also display its stomach in this way when it is happy and wants its stomach rubbed. 4、Fearful or Apprehensive A dog that is fearful or apprehensive lays its ears close to its head with narrowing eyes. The body is held low and the tail tucked between its back legs. The dog may tremble, yelp, growl or whine. 5、Aggressive An aggressive dog’s mouth may be open or drawn back exposing its teeth and the dog may snap its jaws. This is often accompanied with snarling, growling or loud barking. The body is tense and the tail held straight out from the body and the head lowered. The dog’s breed 1、working dog（工作犬） Working dog refers to a type of dog that is not only a pet but also learns and performs tasks to assist human beings. Three kinds of working dogs Guide dogs(导盲犬） Sniffer dogs(搜救犬） Police dogs(警犬） 2、gun dogs(枪猎犬） Gun dogs are types of dogs developed to assis