The word "allergen" refers to something that causes an allergic reaction in our bodies. It could be a substance, like pollen or dust, that can make us sneeze, itch, or have other symptoms if we are allergic to it. Full definition
The most common food allergens in dogs are proteins, especially those from dairy products, beef, lamb, chicken, chicken eggs, soy or gluten (from wheat). (glenerinanimalhospital.com)
This dry dog food is also free from wheat, soy, and corn, which are other common allergens for dogs. (geekwrapped.com)
With this many people in need of allergen free foods, it's no wonder there are so many choices out there. (theholisticmama.com)