Veterinary Medicine - August 2008 - (Page 446) Demodicosis PEER-REVIEWED 1. An adult Demodex canis mite (40X). 2. An adult Demodex injai mite (40X). 3. An adult Demodex cornei mite (modified Wright’s stain; 50X). 4. Nonpruritic spontaneous alopecia in a dog with adult-onset demodicosis. 5. Diffuse comedones in a dog. (Photo courtesy of Lauren Pinchbeck, MS, DVM, DACVD.) fecal examination, heartworm testing) should be performed in all dogs with adult-onset demodicosis. Both systemic and topical immunosuppressive therapies can trigger demodicosis, so obtain a thorough drug history from the client. One of us has witnessed a case of adult-onset demodicosis apparently triggered only by the application of an otic glucocorticoid-containing product twice daily for one month. Clinical signs The primary lesions of demodicosis due to D. canis include spontaneous alopecia, scaling, follicular casts (keratosebaceous material adhered to the hair shaft), papules, and comedones (Figures 4-6). Other lesions include crusts, erythema, hyperpigmentation, and licheni cation. Demodicosis can occur with or without pruritus but is usually more pruritic if concurrent secondary infections are present. Demodicosis due to the short-bodied form of the mite (D. cornei) is often pruritic. Dogs with severe demodicosis involving concurrent deep pyoderma can present for evaluation of additional signs. If you note swelling, pain, peripheral lymphadenopathy, lethargy, fever, and draining tracts, suspect a deep pyoderma. Likewise, evaluate all dogs with deep pyoderma for demodicosis. A deep pyoderma is a potential dermatologic emergency because of the risk of sepsis. Demodex canis infection can also cause ceruminous otitis externa. Otitis can occur in conjunction with demodicosis lesions elsewhere on the skin or be localized only in the ears. Clinical signs of D. cornei infection are similar to those of D. canis infection, but D. injai infection can have a different presentation. Demodex injai infection typically does not cause alopecia but instead is most commonly associated with an oily coat on the dorsum of the neck and trunk. This clinical sign is consistent with the observation of 446 August 2008 VETERINARY MEDICINE
Table of Contents Feed for the Digital Edition of Veterinary Medicine - August 2008 Veterinary Medicine - August 2008 Contents Editors' Note Leading Off ClinQuiz Idea Exchange Practical Matters Diagnosing and Treating Canine Copper-Associated Hepatopathies Canine and Feline Demodicosis CE Form Advertiser Index Product Preview Marketplace/Classifieds Mind Over Miller Veterinary Medicine - August 2008 Veterinary Medicine - August 2008 - Veterinary Medicine - August 2008 (Page Cover1) Veterinary Medicine - August 2008 - Veterinary Medicine - August 2008 (Page Cover2) Veterinary Medicine - August 2008 - Contents (Page 415) Veterinary Medicine - August 2008 - Contents (Page 416) Veterinary Medicine - August 2008 - Contents (Page 417) Veterinary Medicine - August 2008 - Contents (Page 418) Veterinary Medicine - August 2008 - Editors' Note (Page 419) Veterinary Medicine - August 2008 - Editors' Note (Page 420) Veterinary Medicine - August 2008 - Editors' Note (Page 421) Veterinary Medicine - August 2008 - Leading Off (Page 422) Veterinary Medicine - August 2008 - Leading Off (Page 422a) Veterinary Medicine - August 2008 - Leading Off (Page 422b) Veterinary Medicine - August 2008 - Leading Off (Page 422c) Veterinary Medicine - August 2008 - Leading Off (Page 422d) Veterinary Medicine - August 2008 - ClinQuiz (Page 423) Veterinary Medicine - August 2008 - ClinQuiz (Page 424) Veterinary Medicine - August 2008 - ClinQuiz (Page 425) Veterinary Medicine - August 2008 - ClinQuiz (Page 426) Veterinary Medicine - August 2008 - ClinQuiz (Page 427) Veterinary Medicine - August 2008 - ClinQuiz (Page 428) Veterinary Medicine - August 2008 - ClinQuiz (Page 429) Veterinary Medicine - August 2008 - Idea Exchange (Page 430) Veterinary Medicine - August 2008 - Practical Matters (Page 431) Veterinary Medicine - August 2008 - Practical Matters (Page 432) Veterinary Medicine - August 2008 - Practical Matters (Page 433) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 434) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 435) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 436) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 437) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 438) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 439) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 440) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 441) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 442) Veterinary Medicine - August 2008 - Diagnosing and Treating Canine Copper-Associated Hepatopathies (Page 443) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 444) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 445) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 446) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 447) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 448) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 449) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 450) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 451) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 452) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 453) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 454) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 455) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 456) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 457) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 458) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 459) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 460) Veterinary Medicine - August 2008 - Canine and Feline Demodicosis (Page 461) Veterinary Medicine - August 2008 - Advertiser Index (Page 462) Veterinary Medicine - August 2008 - Advertiser Index (Page 463) Veterinary Medicine - August 2008 - Product Preview (Page 464) Veterinary Medicine - August 2008 - Marketplace/Classifieds (Page 465) Veterinary Medicine - August 2008 - Marketplace/Classifieds (Page 466) Veterinary Medicine - August 2008 - Marketplace/Classifieds (Page 467) Veterinary Medicine - August 2008 - Marketplace/Classifieds (Page 468) Veterinary Medicine - August 2008 - Marketplace/Classifieds (Page 469) Veterinary Medicine - August 2008 - Mind Over Miller (Page 470) Veterinary Medicine - August 2008 - Mind Over Miller (Page Cover3) Veterinary Medicine - August 2008 - Mind Over Miller (Page Cover4)
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