Allergies in dogs and cats occur when the immune system overreacts to something that isn’t really a threat. For example, reacting to peanuts, air-borne pollen, or laundry detergent—none of which should cause harm. The material that causes an allergic reaction is called an antigen. Antigens are usually proteins. The term “allergen” is often used rather than the term antigen, but these two terms are slightly different. Antigen refers to any substance causing allergies, and allergen refers to ingested or air-borne substances causing allergies.
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