A hypoallergenic dog is a type of dog that produces less allergens, which are substances that can cause an immune response in some people. These dogs have been bred to produce fewer proteins and other substances that can trigger allergies in humans. As a result, they may be a better choice for individuals who suffer from pet allergies. However, it is essential to note that no dog breed is completely hypoallergenic, as all dogs have some level of allergen production.