The typical fine, straight, and silky Yorkshire Terrier coat has also been listed by many popular dog information websites as being hypoallergenic. In comparison with many other breeds, Yorkies do not shed to the same degree, only losing small amounts when bathed or brushed. The dog's dander and saliva typically trigger most allergic reactions. Allergists recognise that at times a particular allergy patient will be able to tolerate a particular dog, but they agree that 'the luck of the few with their pets cannot be stretched to fit all allergic people and entire breeds of dogs.' The Yorkshire Terrier coat is said to fall out only when brushed or broken, or just said to not shed. Although neither of those statements agree with what biologists, veterinarians, and allergists know about dog fur, allergists 'think there really are differences in protein production between dogs that may help one patient and not another'.