Are you talking blood test or scratch test? Many times, the blood tests can give you false results, although they can be a good resource to work from. It sounds like this has been going on since she was fairly young, which makes me question food allergies as it usually takes a while to develop an allergy to a certain ingredient. I may suspect environmental allergies, which can be tested for as well, but unfortunately you usually cannot change their environment and therefore must be treated by medication.
I really think you are giving your vet a hard time. It takes approximately three months of a new diet to determine whether or not the dog exhibits sensitivity to the new ingredients. These reactions DO NOT go away overnight after changing foods. It can take the body and the immune responses months to level out, so don't expect changes overnight. |