this post was submitted on 30 Nov 2025
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I mean if you had a full data set of known allergies and millions of DNA of people that have and don't have allergies, you may find a genetic correlation of people susceptible. But there's too many environmental factors that would alter that anyway.
But I know the type you mean. On Facebook, a lady contacted my wife claiming she could detect our dog's allergies with a few photos of our dog. LOL.
At least the vets method of sending away a blood sample for testing, and generating a report did give us food alternatives that stopped our dogs allergies.
Wasn't there a huge announcement this year about exposure to allergens at a (very) young age preventing allergies? That would suggest genetics is a very small part of it and environmental factors being much more important.
However, checking hair samples doesn't necessarily mean checking DNA. They could be checking for certain markers like antibodies your body produces. Still sounds like bunk science or it would be much bigger though.