Hello, yesterday this random cat shows up out of nowhere and is constantly meowing at my door and looking through my window. Normally I would find this cute but it makes my cat (Bella) mad and she hissed that this new random cat. This random cat (let’s call him Marco) meows at my window seal in the middle of the night too. I do not know who’s the owner of Marco, maybe he is a stray. One time I opened my door to see what Marco looked like and he walked straight into my house. Please, I don’t know what to do and my cat Bella does not like him.