It is likely that wolves were man's best friends even before dogs were domesticated. This conclusion was made by researchers from Stockholm University.
It's well known that a dog is man's best friend, but even before that happened, our friends were wolves. In Sweden, scientists have proven that these animals are able to distinguish between familiar people and strangers. Moreover, they show great sympathy for familiar people. Moreover, familiar people are even able to calm the wolves in a state of stress.
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The reactions of wolves show that they may have had affection for humans long before dogs became our friends, which happened, most likely around 15,000 years ago. These are the results of testing 10 wolves and 12 dogs. The researchers were interested in how these animals behave in unusual and stressful situations.
Elephant and ostrich become friends in Africa
Wolves showed more affection for familiar people, they approached them and spent more time, even greeted them. It has been proven that wolves, like dogs, prefer familiar people to strangers. To be fair, dogs themselves are descended from wolves, as many scientists believe. (READ MORE) 
Stockholm University
Medicine
Stockholm State University , Sweden. More than 50 thousand students study at the university, 5 thousand employees and about 2 thousand graduate students work.