Unfortunately, no dog can be completely hypoallergenic. In general, the source of allergenic components is found in saliva, urine, sweat and scales (dead skin) of the dog. And if your allergic reaction is mainly due to the dog's saliva, be aware that there is no dog breed with hypoallergenic saliva.
However, this list of dogs represents those that generally create the least reaction, especially because they have less hair or lose less and produce less dead skin. Two elements that help to reduce reactions in allergic people.