There are so many people living with allergies of all kinds that businesses cannot simply cater to everyone. Think about how many people are deathly-allergic to peanuts, but we still make most candy (even without peanuts in the ingredients) in factories where peanuts are used. People with allergies always have to be very careful and it's not something they are new to. Pet dander allergies are very difficult to avoid because you never know who has a pet at home or whether or not your going to be around an animal in a public area.
For many people, pet-related allergies can be controlled by allergy medications. For those with severe reactions, however, this shouldn't be new to them. Those people should be generally always aware of the possibility of service animals on board a plane and would probably take the appropriate steps to ensure their health.
If you are allergic to peanuts you don't get mad at M&M Mars for making Milky Ways in the same factory as Snickers - you don't eat them, because it's not safe for you. The air on planes is circulated so if any number of people on the plane have pets at home, you're in danger. If you have allergies it is YOUR responsibility to ensure your own health.
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