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Skin and Allergy


Dogs suffer from many problems which effect their skin. It is important to understand that the skin is an organ, just as the liver and kidneys are organs. The skin functions as a barrier to protect the body from infection, caustic substances, ultra violet light and dehydration. Good health and proper function of the skin is dependent on the health and function of the other organs which make up our pets bodies. Diseases which effect the skin can be placed into one of two categories: primary and secondary skin disease. Primary skin diseases are those which effect the skin directly, such as mange or flea and tick hypersensitivities. Secondary diseases are those which initially involve other organs and thereby effect the skin, such as hypothyroidism.

The diagnosis and treatment of skin diseases can be difficult and time consuming. The following are some of the common diseases effecting the skin and a brief description of their diagnosis and treatments. Hot Spots or Acute Moist Dermatitis: Hot spots are usually a result of self trauma and resulting infection that occurs as your pet tries to relieve itself from some pain or itch. Treatment includes thorough cleaning, topical and systemic antibiotics, and anti- inflammatory agents.

Pyodermas include a wide range of infections which result in the formation of pus. Pyodermas vary in severity. Treatment is similar to that for hot spots, but typically is longer term. Shampoos and rinses are also helpful.

Atopy or Allergic Inhalant Dermatitis

Atopy is a very itchy skin disease which is the result of allergies to microscopic particles in the air. Diagnosis is based on clinical presentation and absence of other causes such as ectoparasites. Treatment includes dietary supplements, antihistamines and steroids, and is often long term. In very refractory cases skin allergin testing and hyposensitization may be helpful. Shampoos and rinses are also often helpful.

Ectoparasites (external parasites) include mites, fleas, and ticks. These parasites break the barrier formed by the skin and allow bacterial infections to occur. They also may lead to allergic conditions. Diagnosis is achieved with gross observation and microscopic examination of skin scrapings. Treatment depends on the parasites present and include antiparasitic drugs and antiparasitic shampoos and rinses.

Fungal Infections include Malassezia sp., Dermatophytosis (Ring Worm), and Dermal Coccidioidomycosis
Diagnosis is achieved via culture of the organisms, microscopic examination of skin scrapings and blood tests which identify antibodies to Coccidioides immitis. Treatment includes topical and systemic antifungal drugs and antifungal shampoos and rinses.

Food allergies
Food allergies often manifest themselves as skin problems. Food allergies are usually diagnosed by ruling out other possible conditions. Treatment is trial feeding of hypoallergenic diets for a minimum of six weeks.

Irritant Contact Dermatitis
Contact allergies are diagnosed based on history of contact and clinical presentation. Treatment includes washing the exposed areas to remove the irritant. Patients that are itchy are given steroids for a short period of time. It is important to prevent re-exposure.

Autoimmune Skin Diseases
There are several autoimmune skin diseases and the foundation of diagnosis is surgical biopsy. Treatment includes combinations of dietary supplementation, steroids, and immune modulation drugs.

Secondary Skin Disease
Secondary skin diseases such as hypothyroidism are diagnosed via clinical testing for the underlying disease. Diagnosis often requires blood tests, biopsies, and X-rays. Treatment of the underlying condition usually results in improvement of the skin problems.

Diagnosis and Treatment

Your pet's skin problems very often combine two or more of the above diseases. For example, flea infestation hypersensitivity can lead to pyoderma. Because of the complicated interactions between the skin and other organs within the body and due to skin's varied response to insult, diagnosis and treatment of skin disease may be difficult and time consuming.

The skin scrape is the mainstay of diagnosis. Several small areas of your pets skin are shaved to remove hair. A scalpel blade is used to scrape up the top layers of skin. The resulting material is viewed under a high-powered microscope. In addition to skin scrapes, blood tests and surgical biopsies are necessary to diagnose some skin diseases.

Treatment of skin disease may include steroids, antibiotics, antihistamines, topical drugs, antifungal drugs, shampoos and rinses and dietary supplementation or modification and surgical removal of masses. In some cases, therapy must be continued for months and even for life.

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