A dog fight with himself

Rumble /See how a small dog, looking at himself in the mirror, is understanding that there is another dog in front of me. And I can't figure out whether it's quarreling with him or having fun with him. We also used to have such fun many times when we were young. So maybe you will also remember this is all.
Then I am feeling very good, how are you guys feeling please tell me in the comment thank you