Most people don't realize that what they are allergic to is the saliva of the pet.
I've travelled extensively with pets (mainly cats) and several times the cat hasn't said anything until we got to our destination. At that point the person next to me is suddenly deathly allergic... Umm, yea, and you were really deathly allergic for the past 3 hrs I'm assuming... IIRC, if you pay for your pet, it has paid for a ticket and the person who is allergic will be offered to take another flight. That used to be the general standard when I was traveling at least (not that I ever ran into someone who took another flight, suddenly getting from point A to B more important than being deathly allergic to a pet).
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