Animal hair is one of the most common allergens in the world. Some of us can have dog hair allergies, and having a dog can be problematic. Fortunately, one of the amazing characteristics that dogs can have is they are hypoallergenic. What makes a hypoallergenic dog so great is that they don't produce as many allergens. This usually means that they don't fall out or have no hair.
Keep in mind that there are no real hypoallergenic dogs. All dogs produce at least some kind of allergens. We may be allergic to enzymes in their saliva or dandruff. However, there is something that all hypoallergenic breeds share - they seem to cause fewer allergic reactions.