Dogs transmit allergens through their own dander and by tracking external allergens into your house.
Humans are allergic to dander, not fur.
Dander can be found in dog saliva, fur, hair, etc.
Dogs that shed fur less, have hair or are hairless may be less likely to cause Allergies because they leave less material with dander in your home.
Chihuahua's do have fur and they do shed, so they are not the most hypoallergenic dog.
However, smaller dogs are better for allergy sufferers in general because they produce a smaller amount of dander and material that carries dander.
Washing a dog twice per week can help a great deal.
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