Demodex canis is one the major mites causing mange in dogs. It is thought that small numbers of Demodex canis are part of the normal flora of canine hair follicles. Although the exact pathogenesis is not understood, it is generally accepted that there is a specific abnormality of T cell immunity which allows proliferation of the mites in young dogs. Diagnosis is by demonstration of increased numbers of adults or immature stages of Demodex canis on skin scrapings and hair pluckings.

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