Food allergies are pretty uncommon in young pups. Environmental allergies (or another issue causing the itching) is much more likely. What is the vet saying?
You can do an elimination diet (novel protein and carb) and give no treats or chews during that time (at least 60 days - 12 weeks). It needs to be balanced for a puppy.
Blood testing is sometimes recommended for environmental allergies, but usually the skin testing seems to be preferred. Blood testing for food allergies is unreliable and a waste of money.
If there truly is a food allergy in a pup, avoidance for life (not just avoidance a few days a week) is usually recommended.
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