Flea allergic dermatitis

5 Flea allergic dermatitis


This varies between individuals but most pruritic dogs are presented with a history of pruritus and varying lesions affecting the lumbo-sacral region. As the flea life cycle is affected by environmental factors such as temperature and humidity, seasonal exacerbations may occur. Often flea control is only intermittently used and in-contact animals, especially cats, are inadequately treated. The history in this particular case was long and complex. The most relevant parts were:


A whole range of clinical signs, from primary lesions such as papules and pustules, to severe secondary hyperpigmentation, lichenification and fibropruritic nodules are seen, depending on the chronicity of the disease. Self-induced alopecia due to over-grooming and secondary bacterial infection is often seen in affected dogs. Atopic dogs are predisposed to flea bite hypersensitivity, even those that have been well managed. Some dogs will present with pyotraumatic dermatitis on the rump, or at other sites.

The clinical findings in this case were:


A number of the differential diagnoses were ruled out with simple in-house tests:

In addition to atopic dermatitis, the history, clinical signs and distribution of lesions were suggestive of flea allergic dermatitis. The diagnosis of flea allergy dermatitis is supported with additional tests and with response to aggressive flea control. The simplest test is the demonstration of fleas or flea faeces using a flea comb; however, about a third of animals fail to show any evidence of fleas, for various reasons:

Sep 3, 2016 | Posted by in SMALL ANIMAL | Comments Off on Flea allergic dermatitis
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