Dogs can have both food and environmental allergies. My pit bull has both. He is now raw fed and has been for years. The raw diet boosts the immune system and helps with environmental allergies.

The spring and summer the last couple years have been particularly bad. Dogs that have not had issues before have been having problems.

There are so many things that you can try. I would lean more towards environmental factors than food allergies as they are more common. You can give benadryl 1 mg per lb. I'd start with 2x a day.

Licking can cause bigger issues starting with yeast infections up to bacterial infections.

I'd start with a vet visit to make sure it is allergy problems only.