Overall, Purina ONE is the best brand for pet owners who want to buy their dog premium food but don't want to pay premium prices. While it may be a little more expensive than some of the other options out there, Purina ONE still provides excellent value for your money.
As with human allergies, dog allergies are overreactions by the immune system after exposure to allergens. The allergens are non-pathogenic and in this case include things like fleas, dust, pollen and some types of food. With dogs, allergies may affect different systems but mainly manifest with skin and respiratory symptoms that range from mild to severe and very rarely, life-threatening.