Certain cat breeds are considered to be more hypoallergenic than others due to their low level of shedding and production of the allergen Fel d 1. The allergen is a protein found in the saliva and dander of cats, so cats that produce less of the allergen tend to be better for those with allergies. Examples of breeds that are considered to be hypoallergenic include the Siberian, Balinese, Devon Rex, and Cornish Rex.