Here's why:
* Different allergens: Cat allergies are caused by a protein called Fel d 1, found in the saliva, urine, and dander (dead skin flakes) of cats. While big cats (like lions, tigers, and leopards) also have Fel d 1, the levels and specific types of allergens can vary significantly.
* Individual sensitivity: Even if a person is allergic to domestic cats, they may not be allergic to big cats. The severity of allergies varies from person to person.
* Exposure: People are far less likely to be exposed to big cats than domestic cats, so their immune system may not have developed a sensitivity.
It's important to note: You should always be cautious around any animal, especially big cats, as they can be dangerous. If you have a known cat allergy, it's best to avoid close contact with all cats, regardless of their size.