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→Clinical Signs
==Diagnosis==
==Diagnosis==
===Clinical Signs===
===Clinical Signs===
In dogs, flea allergic dermatitis usually causes marked pruritus, although individual variation does exist. Lesions are most typically seen on the caudal dorsum, the inner and posterior thighs and the umbilical area
, but any region may be affected. Within fifteen minutes of receiving a flea bite a papule appears and persits for up to 72 hours, when it forms a crust. However, these lesions may be difficult to appreciate due to the secondary changes that result from self-trauma in response to pruritus. These may include excoriations, erythema, seborrhoea, hyperpigmentation and lichenification. A mild secondary bacterial folliculitis may also be present.
Cats respond to most cutaneous insults in one of four reactions patterns (miliary dermatitis, eosinophilic granuloma complex, head and neck pruritus, symmetrical alopecia). This is also true in flea infestation and flea allergic dermatitis. Miliary dermatitis is by far the most common presentation in this case, but symmetrical alopecia and eosinophilic granuloma complex may also be seen.
dermatitis
===Laboratory Tests===
===Laboratory Tests===