1. Dogs are carnivorous canines. The origin of dogs is widely distributed. Dogs are the earliest domesticated animals. At least 10,000 years ago, dogs became human companions. The most recent ancestor of dogs is likely to be wolves. The domestication of dogs originated in America. Wild dogs initially roamed in groups like wolves to find food. Some individuals found discarded skins, bones or meat near human settlements. Because food was easy to obtain, they risked stopping at human settlements to find food. The docile and docile dogs were allowed to stay, while the other dogs were driven away or killed. After several years of mutually beneficial cooperation and selection, domestic dogs were formed. Subsequently, various strains were further bred. The earliest domestic dog fossils discovered in my country were unearthed at the Hemudu site in Zhejiang Province 7,000 years ago.
2. Dogs are domesticated from wolves. They belong to the carnivorous Canidae. When they live in groups, they also have a "hierarchy" to maintain the stability of the entire group and reduce the fights and wars caused by the competition for food, living space and the opposite sex. Two dog skulls dating back at least 33,000 years ago unearthed by researchers at the University of Arizona in Belgium and Siberia respectively show that dogs were domesticated by humans as early as ancient times.
3. The wolf, or gray wolf, is a mammal of the Canidae family, distributed in most parts of the world. The wolf is the largest species of Canidae in existence and is a national second-class protected animal. It looks like a domestic dog, with a thick skull, a developed supraorbital protrusion, and a thick and blunt postorbital protrusion. The nasal bone is wide in front and narrow in the back. The auditory bulla is slightly triangular.
4. Classification of dogs: There are more than 1,400 dog breeds in the world, of which more than 500 are classified. There are about 240 kinds of dogs included in the world's famous dogs. Generally, dogs are classified according to their height and weight, and can be divided into super large dogs, large dogs, medium dogs and small dogs. The most common large dogs are the Great Pyrenees, as well as the Old English Sheepdog, Retriever, Labrador Retriever, Tibetan Mastiff and Caucasian Shepherd Dog.
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