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There is a note at the bottom of my dogs' blood test for food that says the blood test is not accurate. So fur is definitely not going to be accurate. The gold standard for people for allergy testing is skin scraping. Same for dogs.
 

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New here. Just answered somebody about this very same thing on PDB so I'll copy/paste:

From SkeptVet:

"Coyner K, Schick A. Hair and saliva test fails to identify allergies in dogs. J Small Anim Pract. October 2018. doi:10.1111/jsap.12952

'Our study demonstrates that hair and saliva testing fails not only to identify allergic dermatitis in dogs, but fails to differentiate between animal and non-animal samples, providing essentially identical results, regardless of the origin of the sample.'

These authors submitted not only hair and saliva from dogs with known allergies and dogs without allergies, but also fake hair samples from stuffed animals and water (in place of saliva). All of the samples tested positive for some allergies, and there was essentially no difference between the results and random chance."

Dr. Jean Dodds is, to put it nicely, considered to be more on the "fringe" of her profession by the vast majority of her colleagues, much like Dr. Karen Becker, Dr. Marty, and the Mercola HealthyPets crew. Unfortunately, the appeal-to-nature fallacy, coupled with understandable emotions around pets and lack of scientific background, is strong enough in many owners (and breeders, etc) that she is able to market her medically unsupported theories and products successfully.

A very good evidence-based overview of doggy allergies, some of which may surprise you: https://vetnutrition.tufts.edu/2017/01/food-allergies/
 

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Thank you all for your responses and the information.
 
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