When YouTube gained popularity, someone once said that the Internet was invented for cats. We were then greeted with thousands of cat videos.
Then, PSY came, and humans took over the Internet. Now, virality is fueled by either anger or silliness: you do something that angers people, it will be shared often. You do something silly and funny, it will be shared even more.
But this dog; it shows you that sometimes, you just need to be happy.