9 Dermatophytosis in a Jack Russell terrier
CASE HISTORY
The relevant aspects of the history were:
• New lesions consisting of alopecia, erythema, crusting and scaling had subsequently appeared over the face, limbs and tail.
• Slight weight loss had been noted over the past month, but the dog had remained bright and active.
• One other dog and a cat were part of the household. The dog had developed a similar lesion over the bridge of the nose, although this had resolved spontaneously.
• Previous treatment with several weekly amitraz dips at a concentration of 500 ppm and various 7- to 10-day courses of systemic antibacterial therapy had not resulted in any clinical improvement.
CLINICAL EXAMINATION
Examination of the skin revealed extensive patches of relatively well-demarcated alopecia, erythema, hyperpigmentation, and crusting and scaling over the muzzle, periorbital skin, the left dorsal trunk, the lateral thighs and the forelimbs (Figs 9.1, 9.2 and 9.3).
![image](/wp-content/uploads/2016/09/B9780702028700500130_f09-02-9780702028700.jpg)
Figure 9.2 Well-demarcated patch of alopecia, erythema and hyperpigmentation over the left carpal area.
CASE WORK-UP
The following diagnostic tests were performed:
• Microscopic examination of multiple deep skin scrapings, which failed to reveal the presence of Demodex spp. mites.
• Cytological examination of stained impression smears from the underside of the crusts (Fig. 9.4), which revealed degenerate neutrophils and small numbers of intra- and extracellular cocci. Small numbers of acantholytic keratinocytes were also evident (Fig. 9.5).
• Fungal culture on material collected using the MacKenzie brush technique, together with plucked hairs and scrapes, which grew Trichophyton erinaciei.
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