332 DISEASES/DISORDERS
(a)(b)Fig. 21.14. Alopecic and scaly lesions on the forehead of a 16-week-old male-intact Yorkshire terrier:
(a) normal light and (b) Wood’s lamp. Positive fluorescence is seen as apple-green color on the hair shafts. Note
false fluorescence of the mucoid discharge at the medial canthus (arrows).