Curly Horses are hypo-allergenic in many cases. Hypo-allergenic means that, in this case, the horse is less likely to cause a person who is allergic to horses to have an allergic response. That does not mean that the person will not have an "allergy attack", but that often the symptoms are less severe if they are present at all. So if you visit a Curly Horse, and you are allergic to horses, be sure to take you medicine with you!
We do not know exactly why this is so, and studies are on going. We think it may be because the Curly Horse's hair is different than a regular horses, or that the proteins in their skin are different.
One of our members, Dr. Wolfgang Mitlehner, recently published a pilot study on the hypo-allergenic characteristics of the Curly Horses. You can find it here: http://www.abcregistry.org/#/research/4582203889