What is food allergy and what are its symptoms?

Food allergy is an allergic reaction to one or more ingredients in a pet’s food. The most common allergens are beef and milk products, cereals (wheat, corn, soya), chicken and eggs. The exact cause of a food allergy is not known. Perhaps a change in the pet’s immune system causes certain ingredients to be perceived as “foreign,” initiating inflammatory mechanisms to fight off the perceived “intruder.”