Dog (Cantonese spelling: gau2; English: domestic dog / dog; scientific name: Canis lupus familiaris / Canis familiaris), also known as domestic dog or dog, is a domesticated canine animal. Dogs are close relatives of wolves (scientific name: Canis lupus), and the main difference between the two lies in the degree of domestication: wolves and dogs are genetically very close, and both are social carnivores [Note 1][1], They hunt in packs, and many dog ​​breeds—such as the German shepherd—seem to be very similar to wolves[2]; the fact is that wolves and dogs can be interbred to produce reproductive Therefore, in biology, wolves and dogs can strictly be regarded as the same species[3][4]. The main difference between wolves and dogs is that wolves have a low degree of domestication, and generally do not bury their bodies. In contrast, normal dogs will bury their bodies, and they will make friendly gestures such as tail-wielding.