Parasitic Skin Diseases

• Cause -- Fleas are the most common parasitic skin disease found in dogs. Mange is another type of skin disease which is caused by mites. There are two severe types of mange: sarcoptic mange and demodectic mange.

  Ear mites, lice, and ticks are other parasites that affect dogs. Their presence irritates the dog, leading to self-mutilation.
    Signs -- Sarcoptic mange causes intense itching, loss of hair and crusting of the skin. A dog’s ears, front legs, chest and abdomen are most often affected by sarcoptic mange.

  Demodectic mange can cause itching. The skin is reddened and scaly, and hair loss occurs in round patches resembling ‘ringworm.’ The face and front legs are most commonly affected, although some cases may be generalized. Generalized demodectic mange is often a sign of underlying internal disease or a hereditary problem.

  Ear mites cause severe irritation in the ears. Often, an affected dog will scratch the hair off the back of its ears. Ticks, lice and fleas may transmit other diseases, in addition to causing irritation.

  Diagnosis -- Mange is often suspected on the basis of the case history and the appearance and location of the lesions. A skin scraping test is always performed to aid in identifying parasites. Ear mites, which are barely visible to the naked eye, appear as small white objects. The black debris commonly seen in the ears of dogs with ear mites is a combination of dried blood, normal ear wax and discharges from inflammation. Lice, fleas and ticks can also be seen by close examination of the dog’s skin.
   
• Treatment -- Mange is treated by clipping the affected areas and washing them with an antiseptic. Antimite dips are often necessary and may be used weekly or biweekly for several months. Shampoos can be sued before each dip. The dog’s eyes should be protected with mineral oil or eye ointment and the ears plugged with cotton before dipping. Most cases of mange respond well to this treatment. Antibiotics can be administered in cases of mange where infection may be present.

  Ear mites can be readily treated Initially, your veterinarian may recommend a thorough cleaning of the dog’s ears while the animal is sedated. This treatment can be followed up with home treatments using special solutions or ointments to kill the mites and prevent infections in addition, insecticidal dips, sprays, powders or shampoos are often used.

  Lice, ticks and fleas must be killed on the dog and in the dog’s environment with insecticides. Dips, shampoos, flea collars, sprays, powders, foams and foggers containing insecticides are available from your veterinarian to help control these parasites.

RECOMMENDED BOOKS
Pet Care-ASPCA Complete Guide

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