Dogs, also known as "dogs", were domesticated by early humans from gray wolves. The domestication time was from 40,000 years ago to 654.38+500,000 years ago. They are the earliest domesticated animals and are often called "the most loyal friends of mankind". Their Chinese names are subordinate to dog clauses, and "sentence" means "bending" and "obedience", which is mainly used to describe the image of a dog curling its tail upwards. In East Asian culture, the word "dog" is a typical derogatory term. The name of the dog with praise is "dog", and the word "big" has praise. The most important thing about dogs as human "weapons" is that they bark to defend their homes. The word "weapon" comes from the dog's four mouths, which means that the dog barks in all directions. In ancient times, gas observation said that "the cloud gas in the garrison is shaped like a dog", which means that the role of dogs is "guarding".

Chinese name: domestic dog

Latin scientific name: domestic dog

Nickname: dog, dog

Field: animal kingdom

Phylum: Chordata phylum

Subphylum: Vertebrate subphylum

Class: mammals

Subclass: animals

Objective: Carnivora.

Family: Canidae

Subsubfamily: Caninae

Genus: Canidae.

Species: Wolf

Subspecies: domestic dogs

Dog (English: dog; German: Hund；; Japanese), pictophonetic characters, subordinate dog clauses. "Dog" means "animal". "Sentence" means "bending" and "obeying". "Dog" combined with "sentence" means "animal with curly tail" and "tame animal". Also called "dog". The scientific name is canine lupus erythematosus.

Dog is a subspecies of mammals, canines and wolves. Dogs have keen sense of hearing and smell, and are good at guarding doorways. They can be trained as military dogs, police dogs and other working dogs. Humans mainly use it to guard their homes. Chen Zhisui's Collection of Classrooms contains: "Dogs are loyal to the virtuous. Once the owner adopts it, no matter how poor the owner is, the hungry evil spirits will never forget home or run away from home. The host has no food, but the beloved wants to make another place alive. It is absolutely impossible to send it back several times. Go out during the day, go home with wild food, and the town is a night policeman. When the master trudges to make a living, he always makes babies, forcing him to follow closely, which makes people cry. Compared with dogs, cats are not as good as dogs, but if anyone has delicious food and a good nest, cats will be very happy and will not think about their owners. " His cat and dog ballads: "If you are a dog, don't keep a cat. Cats and dogs are different. Cats don't catch mice when they are full, but people gather when they are rich. Dogs stay at home when they are hungry, and the poor can't drive them away. " Scientific name: Canis lupus familiaris (Linnaeus, 1758) Conservation status: scientific classification of domestication: 1758 Linnaeus called it Canis familiaris species-dog species, but in 1993, Smithsonian Institution and American Mammalian Society reclassified it as a subspecies of wolves.

Edit the basic information of Chinese characters in this paragraph.

Pinyin: gǒu copybook

Radical of simplified Chinese characters: animal head strokes: 5 structure: total strokes left and right: 8 traditional radicals: dog five strokes 86&; 98:QTQK Cang Xie: KHPR Zheng code: QMRJ stroke sequence number: 3533525 quadrilateral number: 47220

Edit this evolutionary history.

A dog is a dog born no later than 14000 years ago, and may even be in

Paper-cut dog photo collection (20 photos)16,000 years ago in Southeast Asia, domestic animals were domesticated by humans from wild wolves. Dogs originated from wolves. At present, an agreement has been reached, but there are different opinions around the specific place of birth and time. So far, the earliest evidence of dog fossils is the mandible fossils from Germany 14000 years ago, and the other is the small canine bone fossils from the Middle East about 12000 years ago. These archaeological evidences support that dogs originated in southwest Asia or Europe, while on the other hand, the characteristics of dog's bone recognition indicate that dogs may have originated from wolves, thus putting forward the theory of dog's origin in East Asia. In addition, different breeds of dogs are very diverse in morphology, which seems to be inclined to the hypothesis that dogs originated from wolves of different geographical groups. Therefore, it is difficult to provide reliable clues about the origin of dogs only through archaeology. A research team composed of scientists from China and Switzerland studied 654 dogs from five continents, and analyzed the base arrangement of a genetic material called "mitochondrial DNA" passed down through the maternal line. It turns out that these dogs have almost the same genes. They believe that the friendship between humans and dogs can be traced back to 654.38+500,000 years ago. At that time, humans in East Asia first domesticated wolves and other animals, and gradually brought domesticated dogs to Europe and even across the Bering Strait to America over a long period of time. East Asia is considered because dogs in East Asia have the richest genetic types. Scientists infer through genetic testing that this area should be the birthplace of dogs, not the Middle East as people always think. Peter Savorlann said: "Many early studies were based on a small amount of archaeological materials in the Middle East, and believed that this area was the origin of dogs, but in fact, only some other animals were domesticated there, not dogs." At the same time, by comparing with the genes of wolves, they think that dogs were differentiated from several different wolves 65438+500 thousand years ago. This research is carried out by two international research groups. On the other hand, a research team composed of American and Peruvian scientists compared the base arrangement of dogs in North and South America with dogs in Asia and Europe, and dogs that lived in Latin America and Alaska before European colonists arrived in America. Studies have found that some genes of dogs in Latin America and Sweden originated from Eurasian wolves in the past. These genes appeared in American domestic dogs before European colonists arrived in America in the15th century. They believe that dogs originated in East Asia and spread throughout Asia and Europe, and then were brought to America by the first settlers from the American continent across the Bering Strait 65,438+0.2 years ago. Swedish livestock expert Bo Zhan Sen thinks it is "very convincing" that East Asians domesticated dogs first. The first settlers in the United States brought dogs, which showed that dogs had lived with Asians for many years before that.

The habit of editing this paragraph

1. Dogs are carnivores. When feeding, it is necessary to prepare more animal protein and fat in the feed, supplemented by vegetarian ingredients to ensure the normal development and healthy body of dogs. 2. The digestive tract of dogs is shorter than that of herbivores. The hydrochloric acid content of dog's stomach ranks first among domestic animals, and its intestinal wall thickness has strong absorption ability, so it is easy to digest meat food. Dogs belong to the family, and they don't chew much when eating, which can be described as "wolfing down". If you want to feed coarse fiber vegetables, you'd better chop them up or cook them. 4. The dog's defecation center is not developed enough to defecate on the move, so we should give it a certain defecation time. 5. Dogs like to bite. This is also the habit of biting prey in the original ecology. When feeding, we should always give it some dog bones (dogs bite gums, but we can't feed it poultry bones, and it's best not to feed pigs and cows, otherwise it may suffocate) to facilitate grinding teeth. 6. Dogs have unique self-defense ability. After eating toxic food, they will cause vomiting reaction and spit out toxic food. 7. In hot summer, the dog's mouth is wide open and its tongue is very long. It dissipates heat by evaporation of water in saliva. 8. When dogs live in groups, they also have a "hierarchy" and a master-slave relationship. Establishing such an order can maintain the stability of the group and reduce the struggle caused by the struggle for food and living space. 9. When the dog lies down, it always turns around to see if there is danger around. After making sure there is no danger, he will sleep peacefully. 10. Dogs like to be touched on the neck and back. Try not to touch the top of your head, because it will make it feel depressed and dizzy. Besides, you can't touch your ass and tail. "Dogs can't change and eat shit" is the biggest vice of dogs and must be corrected. 1 1. The code of conduct for dogs to treat strangers is to judge the strength of their opponents according to their eyesight. When a stranger approaches, the oppressive feeling of coming down from above will make him feel uneasy. If you keep a low profile, he will accept you. If it is lower than the height seen by eyes, it will be safer. The dog's weakness is on the right, and it will take action to protect the right. When it is cornered, it will lean its right side against the wall and its left side will face the enemy. This habit is a dog's innate instinct. The dog shows its belly to others as a sign of obedience and surrender. 12. There are certain rules in dog society. They will never attack their opponents who fall and show their bellies. When a dog sleeps with its stomach down, it means that it is very relieved or trusting, so that people can see or touch its stomach. By the way, the only cruel animals that can violate similar customs are humans and birds. Dogs like people better than their peers, not only because people can take care of them and give them food and shelter. The main reason is that dogs keep company with people and build feelings. Dogs have a strong sense of protection for their owners. 13. Dogs have territorial habits, that is, they occupy a certain range and protect it from other animals. They use the secretion of anal gland to make feces have a special smell, the sweat secreted by sweat glands between toes and the pictures of scratching with hind legs on the ground as territorial marks. Dogs are very jealous. When you pay attention to the new dog and neglect to take care of it, it will get angry, disobey its habit and become irritable and destructive. Dogs also have vanity and like people to praise them. When it does a good deed or does some tricks, you clap your hands to praise it and touch it, and it will be as satisfied as a full meal. Dogs are also shy. If they do something wrong or have their hair cut too short, they will hide somewhere until they are hungry. 14. In terms of memory, dogs never seem to forget the voices of people close to them, and they can also remember the places where they lived. However, some people think that dogs rely on their sensory sensitivity to recognize the voices of acquaintances and know the location. Dogs like to smell anything. Smell territory marks, new food, poison, feces, urine and so on. When a dog is wandering outside, we often see it constantly urinating or squatting and scattering feces on the road. It relies on these "smelly marks" to walk. Dogs like to chase animals. Like hunting small animals. Chase rabbits, cats, sheep, etc. Even chasing humans, people use this characteristic of dogs to drive away cattle and sheep and protect themselves.