Are there any dog breeds that are hypoallergenic?

There are various coat types that are said to produce fewer allergens: single-coated dogs, who do not have a thick undercoat; dogs whose coat continues to grow, like human hair, rather than shedding regularly; and hairless dogs. These breeds usually shed less dander and hair and are, therefore, considered hypoallergenic. However, even hairless dogs can produce enough dander to affect a highly allergic person.