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Allergic Dermatitis

Etiology
  • Airborne Allergens: Atopic dermatitis is often triggered by inhaled allergens such as pollen, house dust, or mold.

  • Food Allergies: Some pets develop allergic reactions from certain ingredients in their food, which can cause skin inflammation.

  • Fleas: Flea bites can worsen allergic dermatitis, leading to flare-ups and additional irritation.

  • Yeast and Bacterial Infections: Secondary infections (especially in the ears and skin) can complicate the condition.

  • Genetic Predisposition: Certain breeds are more prone to developing atopic dermatitis, including many terriers, retrievers, and bulldogs.

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Clinical Signs
  • Itching and Scratching: Dogs and cats with allergic dermatitis frequently lick, bite, chew, or scratch their skin, particularly in areas like their feet, flanks, ears, armpits, and groin.

  • Red, Inflamed Skin: The affected skin becomes irritated, red, and bumpy, often resulting in patchy hair loss.

  • Skin Texture Changes: The skin may become dry, crusty, oily, or thickened, depending on the pet.

  • Ear Issues: Pets may develop redness and heat in the ear flaps, often accompanied by yeast or bacterial infections due to the overproduction of wax.

  • Behavioral Changes: Animals may rub their body or face against furniture or the ground in an attempt to relieve itching.

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Diagnosis
  • Veterinary History: Identifying environmental or food-related triggers, as well as previous infections or flea treatments, is key to diagnosing allergic dermatitis.

  • Physical Exam: A thorough examination of the skin, ears, and coat to identify signs of inflammation, infections, or hair loss.

  • Allergy Testing: Skin tests or blood tests may be used to identify specific allergens, especially for airborne triggers.

  • Microscopic Examination: To check for secondary infections such as yeast or bacteria, skin scrapings, or ear swabs may be taken.

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Treatment and Management
  • Medications:

    • Steroids: Steroidal medications are commonly used to control inflammation and itching.

    • Antihistamines: Used similarly to human treatments to alleviate itching and reduce allergic responses.

    • Antifungal Treatments: For managing yeast infections, particularly in the ears.

  • Medicated Baths: Special shampoos designed to soothe inflamed skin, reduce irritation, and calm inflammation can provide relief.

  • Flea Control: Maintaining an effective flea control regimen is essential to prevent flare-ups, as flea bites exacerbate allergic dermatitis.

  • Supplements: Omega-3 and Omega-6 fatty acids, known for their anti-inflammatory properties, can help improve skin health and reduce irritation.

  • Environmental Control: If the specific allergens (e.g., pollen, dust mites) are identified, minimizing exposure through environmental management (e.g., air purifiers, avoiding outdoor allergens during peak seasons) is ideal.

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Prognosis
  • Chronic Management: Atopic dermatitis can often be managed but not cured, especially when caused by airborne allergens. Treatment may need to be ongoing to control symptoms.

  • Flare-Ups: Secondary infections (e.g., yeast or bacterial) can complicate the condition and require additional treatment.

  • Improvement with Treatment: While a complete cure is rare, symptoms can often be significantly controlled with medication, baths, and lifestyle adjustments.

  • Breed-Specific: Some breeds, particularly those with genetic predispositions, may experience recurring episodes throughout their lives. Early treatment helps manage flare-ups and improve quality of life.

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