Originally Posted by Nevsky
Frankly, I am surprised there have not been many actions under the Americans with Disabilities Act (or at least that I know of). Breathing is a major life activity. Cats and dogs can severely constrict an allergy sufferers air passages.
Interestingly, ADA also ensures that people can take animals with them if they are guide/"comfort" animals. I vaguely remember someone was trying to get her tortoise accepted as a comfort animal (or something).