Are Any Cats Truly Hypoallergenic?
No. No cat breed is 100% hypoallergenic.
All cats produce the Fel d 1 protein — the primary cat allergen. It's found in cat saliva, skin glands, and urine. When cats groom, Fel d 1 coats their fur. It then dries and becomes airborne.
What varies between breeds is how much Fel d 1 a cat produces. Some breeds produce significantly less. That's what makes certain cats more tolerable for allergy sufferers.
Hair length is mostly irrelevant. A short-haired cat that produces lots of Fel d 1 will trigger more reactions than a long-haired cat that produces little of it.
