Peanut Galley

AITOOW wonders why people with peanut allergies get special treatment? I've never heard of any other allergy changing airline behavior. What about people who are allergic to dogs? There has to be a host of people that are as dangerously allergic to almost everything allowed on a plane. How did this one affliction break through? Is it it just a case of certain stewardesses going rogue? Not policy?