I don't know about the Rex cat.
In dogs, those with HAIR are less likely to trigger an allergic reaction, than those with FUR. A dog with hair needs regular grooming, either at the salon or do it yourself. It is a lot of work, but worth it IMO.
I am guessing the same would apply with cats. He should "test" a cat with hair. BUT . . . the allergic reaction is triggered by an enzyme in saliva. Dogs don't self groom the way cats do, so it may well be that even in cats with hair, you can't avoid the reaction.
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