DH is allergic to cats and has asthma. Not a great combo 
Of course I still wanted cats despite this irritation minor hiccup so I researched what to do for him in order that we might be able to have cats.
Apparently white fur is somehow more allergenic than black. I got black cats with white paws due to this.
The allergy is normally to proteins in the dander. I bought a Furminator and Petal Cleanse. I also got DH Beconase Hayfever Relief. I have to say that this combo has stopped the wheezing that he started doing to the extent that he had to use his nebulizer. If he doesn't take the Beconase twice a day then you can hear the mucus build up.
The cats love the brushing and washing with the Petal Cleanse as well which is a bonus.
Best of all, I don't have to live in dread that the cats will have to go as my DH is too poorly 