Witness Bert, hanging out in one of his favorite places: the middle of the dock.

See that little orange fluff waaayyyyy down towards the other end of the dock? That's Whistler, the Nova Scotia Duck Tolling Retriever (yep that's a breed) that belongs to marina neighbors.
Note that Bert is not even bothering to look at him. Such a cat.
He's scared of Bert. He will NOT pass him on the dock. He did get closer, but they remained in a standoff here for about five minutes.

Eventually, Whistler turned around and went back to his boat... Bert's dominance unquestioned.