The origin of the domestic dog (Canis lupus familiaris or Canis familiaris) is not clear. Whole-genome sequencing indicates that the dog, the gray wolf and the extinct Taymyr wolf diverged around the same time 27,000–40,000 years ago.[3] How dogs became domesticated is not clear, however the two main hypotheses are self-domestication or human domestication. There exists evidence of human-canine behavioral coevolution.
The term personality has been applied to human research, whereas the term temperament has been mostly used for animal research.[18] However, both terms have been used interchangeably in the literature, or purely to distinguish humans from animals and avoid anthropomorphism.[19] Personality can be defined as “a set of behaviors that are consistent over context and time”.[20] Studies of dogs' personalities have tried to identify the presence of broad personality traits that are stable and consistent over time.[19][20][21][22] more on this