Page 1468 - Clinical Small Animal Internal Medicine

1406 Section 12 Skin and Ear Diseases

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Figure 159.6 Self‐induced noninflammatory alopecia on the Figure 159.8 Eosinophilic plaque lesions on the ventral abdomen
abdomen of an atopic cat. of an allergic cat. Several individual plaque‐like lesions coalesced
to form the large plaque in the image.

Figure 159.7 Miliary dermatitis lesions (crusted erythematous
papules) on the ventrum of an atopic cat. These lesions were Figure 159.9 Unilateral indolent ulcer on the upper lip of an
readily palpated, but not easily visible until the patient was allergic cat.
shaved.

reported in dogs, the disease may start off fairly mild with only in the spring, but now extend into the summer and
regard to severity of pruritus noted, or be limited to only fall) and eventually be present year‐round. Seasonal flares
certain body regions. However, as the dog ages, and par- or worsening may still, however, be present in these dogs.
ticularly if therapeutic intervention is not pursued, the
disease will commonly progress. More severe pruritus is
generally reported and more body regions become Diagnosis
affected over time. Additionally, the seasonality of the
disease will often change; what may have begun as very The diagnosis of atopic dermatitis is based on a consist-
seasonal pruritus will show evidence of extension of sea- ent and fitting history, clinical signs, and exclusion of
son (e.g., signs of atopic dermatitis may have initially been all other pruritic dermatoses. There is no test which