Your veterinarian may recommend hyposensitization. Once the pet’s allergies are identified, a mixture or vaccine of specifically prescribed allergens is formulated. This vaccine is made up of the offending allergens and is given in small doses that are gradually increased over time. The allergenic extract in the vaccine reduces the sensitivity of the pet to those allergens. In this manner, allergic symptoms are controlled without the undesirable side effects that can occur when corticosteroids or similar drugs are prescribed.