Allergies

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Allergies...
A Common Problem in Our Pets

What is an allergy?

Allergy is a disease in which the immune system reacts abnormally to substances such as pollens, mold spores and certain foods. The offensive substances causing allergies are known as allergens. Allergic reactions are usually caused by inhaling or ingesting the allergen. Food allergies comprise about 10% of allergic pets. Direct contact allergies are less common in our pets.

What is allergic inhalant dermatitis?

Allergic inhalant dermatitis (atopy) represents one of the most common skin problems in pets. Most affected animals react to a variety of in-haled substances, such as tree, grass and weed pollens, molds, house dust, house dust mites and dander. Whereas people with allergies often sneeze, allergic pets develop itchiness (pruritus).

 

What are the clinical signs of atopy?

Pets lick, chew and scratch, and have decreased resistance to infection. A common sign is chewing at the feet and the constant licking may stain the haircoat with a rust-like hue. Other itchy areas include the face, flanks, groin and armpits (axillae). The ears are also involved in many cases and the ear flaps (pinnae) may become reddened with the inflammatory process.

Atopy is the most common cause
of recurrent ear infections.

How does my pet develop allergies?

Most pets with allergies inherit the tendency from their parents. Clinical signs become apparent after continual exposure to the offending allergens for months to years.

When are allergies most likely to occur?

Allergies occur whenever the offending allergens are present. House dust mites, mold spores and food allergies will produce clinical signs year round, while allergies from plants that pollinate during warm months are apt to cause allergies only when they pollinate.

How do I know if my pet has atopy?

If your pet is persistently chewing its feet or scratching at its face, atopy may be a possible cause. Allergy diagnosis requires eliminating other causes for your pet’s clinical signs such as fleas, thyroid disease and skin infection.

We may recommend intradermal allergy testing (skin testing) to confirm the diagnosis. This is a procedure modified from that used in people. Because this is a relatively specialized procedure, your pet will be referred to a veterinary dermatologist. Blood tests are also available but are a less desirable option.

How do I treat my pet’s allergies?

If the allergy is mild, control may be achieved by avoiding contact with the offending allergen. Strict flea prevention for the pet who has allergic flea dermatitis is an excellent example. Food allergies are treated by putting your pet on a hypo-allergenic diet. Most allergens, however, are virtually impossible to avoid, resulting in the need for alternative allergy treatments. A variety of medications are available, including:

Antihistamines:
(Benadryl, Hydroxyzine and Amitriptyline) are useful in the treatment of atopy. About one-third of atopic pets may receive some benefit from antihistamines. The major advantage is that antihistamines are relatively safe compared to corticosteroids.

Omega 3 & 6 Fatty Acids:
These are natural anti-inflammatory agents which may be helpful in the treatment of atopy. EFA-Caps contains omega fatty acids and can be safely used year-round with minimal if any side effects.

Medicated Shampoos & Rinses:
There are a variety of shampoos and rinses such as Relief Shampoo and Relief Creme Rinse that are specially formulated to aid in the control of atopy. They contain colloidal oatmeal to soothe your pet’s skin, and analgesics for relief of itching (pruritus). Always use cool to cold water when bathing your pet—this is more relieving than warm water.

Topical Medications:
Topical medications such as DermaCool, Gentocin Topical Spray and Relief Spray contain a variety of low concentrations of cortisone, antihistamines and antibiotics, which are very beneficial for your pet’s allergies.

Corticosteroids (Glucocorticoids): 
Prednisolone or Prednisone are among the most widely used (and abused) class of drugs in     veterinary medicine. Because of the many potential side effects, corticosteroids should be cautiously used. It is very important to follow label instructions and gradually taper your pet’s dosage over the specified period of time

Atopica (Cyclosporine):
CsA (cyclosporine) is an immunosuppressive drug that blocks the activation and proliferation of
T lymphocyte cells, which are the main triggers of an allergic response. Recent studies have shown that CsA is as effective as corticosteroids, but without the side-affects that we see with long term cortisone use.

Owners of atopic pets should be familiar with the medications used
to treat atopy. Long-term use is usually necessary and potential side
effects can occur—we will be happy to discuss any questions or
concerns your might have about the use of these medications.

Should I have my pet skin-tested for atopy?

Atopy is a chronic, life-long condition. Immunotherapy (allergy shots) has the advantage of decreasing the need for drug therapy. The disadvantage is that it is a slow process, sometimes taking up to a year before improvement is noticed. Approximately 75% of pets are helped with immunotherapy regimens.


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