There is no such thing as a hypoallergenic dog. All dogs produce dander, which is the main allergen in dogs. Even so-called hypoallergenic breeds still produce dander, they just produce less of it. There is also no way to predict how allergic a person will be to a particular dog breed, even if they are supposedly hypoallergenic. The only way to know if a dog is safe for a person with allergies is to spend time around the dog and see if they experience any symptoms.