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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.
A chihuahua mix is a mixed breed dog between a chihuahua and any other breed. Due to the size differences, they are more often than not mixed with other small breeds although medium and larger ones are also commonly used in the mix. The chihuahua’s small size and unique aesthetics make for a very eclectic resulting mix with unique pups that contribute to their popularity.