My cat's weird behavior.

[Ocelot II]

4. Cats can be very territorial. Mine gets the same way when she sees

another cat in the yard, even though she's safe inside. She'll growl and fluff up, and occasionally has had the same kind of hissy fits you describe. If the other cat belongs to a neighbor maybe you could ask them to keep it inside? Or you could just yell at it and try to discourage it from hanging around your door. But your cat's behavior is normal because cat.