There may not be a more heavyweight battle than a wild wolf battling a pit bull.
When it comes to animal behavior, there may not be a more assertive or dominant species than the wolf. They have a clear pecking order and pack mentality that transcends most species and certainly all breeds of domestic dogs.
However, there is one exception: a well-known American breed with a nasty streak a mile wide.
Here's the video:
While the video is a little grainy, it still appears to be an actual wolf that comes into the scene, and quite aggressively at that. It ultimately leaves with its tail tucked between its legs. It really did seem to be hunting the dog at first, not knowing what it was getting itself into.
Fortunately, these two didn't do any real fighting and both walked away with all their skin!
That wolf who learned not all creatures in its world are prey animals.