You would do much better keeping the 'hair down' with brushing daily. It is not the hair that causes the allergy, it is the dander and the enzymes in the cat saliva which gets licked onto the hair that causes the problem. I have asthma and am allergic to cats; I have 8 cats. I started with the cat allergy when my roomie and I were breeding cats and I had up to 24 at a time. My pulmonologist helped me keep my cats by giving me pointers to keep down the dander. One of these was to not sleep with the cats. The other was to rinse the cats (not shampoo or bathe) with warm water weekly to cut the antigens on the skin and fur of the cat, as well as daily grooming of each cat to eliminate loose hair/dander building up in the environment. Also to use a really good hepa filter vacuum in the house. It worked, I still have cats; but I no longer breed. I also noticed I actually get less allergic to my individual cats the longer I have them; my doctors says my body gets used to their individual dander and antigens. I can still have a full blown allergy attack when meeting a strange cat or letting a nonresident cat get in my face or scratch me. There are hundreds of ways to control your allergies; look on line for ways to help yourself, especially with online allergy management and cat info sites.