Reliable diagnosis of allergies, especially food allergies, is far from an exact science. Neither the skin tests which inject antigens into the skin and look for reactions, nor ELISA (enzyme-linked immunosorbent assay) or RAST (radioallergosorbent) tests which detect antigen-induced antibodies in the dog's blood, have proven to be accurate or reliable--false positives and false negatives are common (again, especially when used... read more
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