Yup. Sounds like they might need to find another cat sitter. I empathize. I am so allergic to cats, that within being near a cat for about 10 minutes, I have such an asthmatic reaction that unless I immediately put myself on the nebulizer, I end up in the emergency room. Fortunately, my parents finally gave their cat away after seeing me so sick so many times, and I don't have any other exposures to cats anymore. The shame is, I really love cats. I even owned cats for a few years, but when I became pregnant with my first child, the allergy kicked in full force and never improved. The allergist said severe changes in allergies with pregnancy is not uncommon. I had never heard of such a thing but since have known two other women who have gone through the same crazy allergic changes.