Both feathers and the droppings from birds can increase the allergen exposure. This also applies to the droppings of other caged pets, such as the guinea pigs and ferrets. The animal hair is not considered to be a very significant allergen, however, the hair or fur can collect pollen, dust, mold, and other allergens.
Although individual pets may produce more or less allergen, there is no relationship between the pet's hair length and allergen production. There is also no such thing as a non-allergenic breed. With ferrets and guinea pigs the most important sources of allergens are the saliva and urine.
Once dry, these secretions become airborne and can be a source of allergic reactions. The best pets are fish, reptiles and hairless pets. The best out of your choices I think would be a guinea.
Guinea Pigs are trainable as far as where they go to the bathroom, ferrets on the other hand have been known to be fairly messy. You want something that doesn't create a big mess, the more of a ... more.
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