If your animal has been treated by your veterinarian for the condition prior to consultation with the complementary practitioner, this second opinion practitioner will require a veterinary history from your veterinarian, together with the results of any tests performed. This is an ethical requirement. It is also recommended that you ask your veterinarian for a referral to the complementary practitoner even if he/she has not seen your animal for the condition, as this communication ensures that your veterinarian is fully aware of the treatment being given.