The cat meows the house down when it sees the neighbor's cat adversary at the front entrance.

The loudest hissing I've ever heard was followed by an attack.

As many astute YouTubers have noted, I have no idea how to handle cats. My friend's cat owns it. I've never owned a cat, and I've never professed to be an expert cat trainer.
Toulouse is the name of the cat in question, a very healthy, content (though slightly unbalanced) house cat who had a difficult childhood. Now, we get along great.