The most accurate way of testing for food allergies is with
an elimination diet trial using a hypoallergenic diet.
An elimination diet trial is the only true way to detect an allergy; your veterinarian can prescribe it
As bloodwork allergy testing is notoriously poor in diagnosing food allergies, many vets recommend that the only way to know for sure if your dog has a food allergy or intolerance is to do
an elimination diet trial.
The only way to really know for sure about your dog's potential food allergies is to work with your veterinarian to develop
an elimination diet trial.