Dogs have been with humans for at least 15,000 years . Thanks to science, we know that hundreds of thousands of years ago, humans walked alongside the ancestor of the domestic dog, an extinct species of the wolf.
According to research from the University of Linköping (Sweden), the origin of this friendship with the social skills that it entails has a genetic basis . The experts identified five related genes that in humans are linked to behavioral disorders, such as autism or schizophrenia.
