Though the two occasionally get a bit rough with one another, it's all in good fun. Dr. Marc Bekoff, cofounder of Ethologists for the Ethical Treatment of Animals with Jane Goodall, tells The Dodo that "this is good old reciprocal, cooperative, and fair play ... if the fox didn't like it he/she wouldn't come back for more." Bekoff says that he has seen similar behavior in both dogs and red foxes when they play.
Canine behaviorist Mia Cobb suggests to The Dodo that it's possible the friendship may have blossomed because "perhaps they are the only canids in the area." In this case, the playdates are not only fun, but enriching for the two creatures.
You can watch the full video from Take a Hike Photography below.