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Handling autoimmune conditions in pets

By Dr. Jim Randolph

McClatchy Newspapers

A reader with a pet named Rosie has asked a question about Rosie’s illness, an autoimmune condition.

Let’s start with the basics of what autoimmune conditions are.

The immune system is charged with the task of keeping us healthy by killing things that invade the body such as bacteria, viruses, cancer cells, parasites, or anything else that can cause disease or damage to the body.

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It is when these perfectly normal functions of the immune system go awry that problems occur. The word "auto" comes from the Greek prefix autos, meaning "self." So, when the immune system begins to attack the very body it is charged with protecting, self, we have an autoimmune condition.

Autoimmune conditions can affect any part of the body. The letter presently at hand about Rosie deals with a condition called autoimmune hemolytic anemia, or AIHA. This condition occurs when the immune system determines that red blood cells no longer belong in the body and are targeted for destruction and removal. The result is broken-down red blood cells in circulation, which then have to be removed by the spleen and the components recycled to make new red blood cells. The degree of illness depends on the degree of attack: if only a few red blood cells are damaged, neither the patient nor the owner notices.

But, when the attack causes the number of red blood cells to drop to a point where oxygen-cazrying capacity is reduced, the patient becomes sluggish, pants to breathe, and may have yellow skin and red urine. This is truly an emergency crisis.

The other big category of autoimmune conditions affecting dogs evidences itself in the skin. Conditions such as Pemphigus foliaceous, bullous pemphigus and systemic lupus erythematosus (which can affect nearly every organ of the body, including the skin) are primarily attacks on proteinaceous components of the skin and/or structures immediately under the skin. The lesions usually appear as deep, draining wounds that may be very itchy. The lesions are frequently infected and will not heal without treatment.

What causes autoimmune conditions? Let me start by saying that the not all causes of all cases of autoimmune attacks will be identified. When autoimmune disease experts get together, they talk about triggers.

Triggers for some patients may be certain foods, certain medications or certain allergens. Some triggers may be "pulled" at birth and just waiting for the bullet to come out. These are patients whose genetic code, most closely linked to breeds and families, puts them at higher risk for an autoimmune attack. They are literally attacks waiting to happen.

Treatment for autoimmune disease is focused on removing the cause or trigger, if it can be identified. Again, since the cause rarely is identified, treatment is usually symptomatic and aimed at suppressing the immune system attack on the affected system of the patient.

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