I think it's fine. My mother has a real phobia of snakes. She almost crashed her car once because she thought a hose in the street was a snake. When you consider that, I think it's considerate to put a warning on certain pets. I think the wording might be a bit offensive, though. "Creepy crawly" would not be my phrase of choice. I think the warning with the name of the animal's species would be a better idea.
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