If your neighbor goes pale and rushes away when he sees your pet kitty, he may suffer from ailurophobia, a debilitating fear of cats.
Ailurophobia is a fancy word for "irrational fear of cats" that comes from Greek roots ailouros, "cat," and phobos, "fear." This word describes an uncommon mental health condition that often includes anxiety triggered by even the thought of encountering or touching a cat. While the overwhelming feelings of fear or hatred aren't entirely rational, they can be caused by a traumatic event in childhood, like being scratched or bitten by a cat.