Just like people, your pet can show allergic symptoms when their immune systems begin to recognize certain everyday substances-or allergens- as dangerous. Even though these allergens are common in most environments and harmless to most animals, a cat with allergies will have an extreme reaction to them. Allergens can be problematic when inhaled, ingested or through skin contact. As his body tries to rid itself of these substances, a variety of skin, digestive and respiratory symptoms may appear. Below are suggestions to help the body support your cat who has allergies.