Natural selection is one of the four mechanisms of evolution. However, human beings are able to produce their own selected species by artificial selection. Scientists select desirable traits for organisms, rather than leaving organisms to evolve by themselves. Dog domestication and breeding are works of artificial selection. All dogs have a common ancestor of the grey wolf but recent researches have shown that the dogs are originated from different subspecies of grey wolves. Early domestication was selecting for behaviours; such as decrease of aggression because they were seeking for wild power under their controls. Lately, DNA evidence shows that dog domestication has occurred in different cultures with different subspecies and later they