The little guy is having a great time chasing the girls. They're laughing, he seems to be enjoying it and everything is great...until the little girl in the blue princess dress totally eats it. Suddenly, all bets are off.
You've gotta watch the video to see what he did when his new friend fell flat on her face. Basically, this just proves the point that animals > humans because we've all had that moment where someone falls down right in front of us and as we're full-on laughing at them, we realize that our social filter has apparently taken the afternoon off.