That cat outside your window? To your cat, she's a barbarian at the gate. Cats are territorial by evolution. They protect their space, their food supply, their hunting ground, their right to exist in a space. That instinct doesn't disappear just because they live in your living room. When a feral cat outside starts leaving scent around your porch, your indoor cat feels it like an alarm going off. The sprinting toward the window, the territorial marking along the perimeter of the house, the wall-to-wall tension? That's not random. That's a cat defending what they believe is theirs. And when you introduce a new cat by just "letting them work it out," you're asking two animals wired for territorial war to skip every step that makes peace possible. Positive associations need to be built carefully, one small step at a time.
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