The types of dogs are Beijing Terrier, China Garden Dog, Maltese Dog, Poodle Dog, Small Dachshund Dog, Hui Bite Dog, Tibetan Mastiff, Pomeranian Dog, Song Shiquan, Small Schnauzer, Shih Tzu Dog, Miniature Beagle Dog, Hilde Dog, Border Collie Dog, Chihuahua, Fox Terrier Dog, Bajie Dog, West Highland White Terrier Dog and Yorkshire Terrier. French bulldog, English cocker spaniel, Irish Setter, Siberian sled dog, Welsh Ke Jiquan, Samoyed, Boxer, Little Deer, Du Binquan, Great Dane.

Second, the characteristics of dogs

1, the olfactory sensitivity of dogs ranks first among all animals, and blind dogs can live like normal dogs with their noses. Dogs' acute sense of smell is mainly manifested in two aspects: first, they are sensitive to smells; The second is the ability to distinguish smells.

2. The auditory induction force can reach1.2000 Hz, which is 6 times that of human beings. The farthest listening distance is about 400 times that of human beings. Dogs are also twice as able to distinguish the direction of sound as humans, and can distinguish 32 directions. For human passwords and simple languages, dogs can establish conditioned reflex according to the changes of tone and syllable.

3. The dog's vision is only about three-quarters of that of human beings, and among all animal species, the dog's vision is about medium. The dog can only see 25 degrees with one eye, so it can't see the nearest distance ahead.

4. The canine teeth are all short crowns, and the crowns of the first and second maxillary incisors are three peaks, with canine peaks in the middle and small peaks on both sides. Other front teeth have two smaller peaks than dogs, and canine teeth are tapered and sharp, which is a powerful weapon for attack and self-defense. The front teeth are three peaks, and the day teeth are multi-peaks.

Extended data:

Dogs belong to Chordata, Vertebrate, Mammalia, Orthoptera, Carnivora, Schipoda and Canidae. Chinese is also called "dog", and dogs are distributed all over the world. Dogs, horses, cows, sheep, pigs and chickens are also called "six animals".

Some scientists believe that dogs were domesticated by early humans from gray wolves. The domestication time was from 40,000 years ago to 1.5 million years ago, and it has developed to this day. Known as "the most loyal friend of mankind", it is the pet with the highest feeding rate at present. Its life span is about ten years.

In China culture, dogs belong to one of the 12 Zodiacs, ranking 1 1 among the 12 Zodiacs. Dogs are domesticated by wolves. As early as the era of hunting and gathering, people have domesticated dogs as hunting assistants. So dogs are the earliest domesticated domestic animals. Dog bones have been unearthed in Cishan, Wu 'an, Hebei, Peiligang, Xinzheng, Henan, Hemudu, Yuyao, Zhejiang, which proves that it has a long history of domestication.

References:

Dog _ Baidu encyclopedia