[107barney]

There's no doubt you can test for antibodies by anestizing a dog and doing a biopsy as is done with a scope. The theory this somehow makes its way into saliva is a huge stretch that no one but Dodds and her followers buy into. Taken from Skeptvet --
"There is no research to suggest that the saliva testing is useful for identifying food allergies. It is sold based on questionable theory and anecdotes, which have little evidentiary value. And as far as uncontrolled testing, at least one dermatologist has run the test in dogs with confirmed food allergies responsive to diet change, and the test results were highly inaccurate."