Humans’ oldest companion, the dog, was first domesticated at least 20,000 years ago. The ancient dogs were an essential part of life, and they were used for hunting, herding and sledding among other activities.
In a cross-cultural analysis, Washington State University researchers found several factors may have played a role in building the mutually beneficial relationship between humans and dogs, including temperature, hunting and surprisingly - gender.
An international team of researchers that includes a Texas A&M University professor has studied the lineage of dogs and found that there were at least five different types of dogs as far back as 11,000 years ago.