Flea allergy dermatitis
is an eczematous itchy skin disease of dogs and cats. For both of these domestic species flea allergy dermatitis is the most common cause of skin disease. Affected animals develop allergic reactions to chemicals in flea saliva. Dogs
with flea allergy dermatitis (FAD) often show hair loss and eczematous
skin rash on the lower back, upper tail, neck and down the back of the legs. Cats
with FAD may develop a variety of skin problems, including feline eosinophilic granuloma
, miliary dermatitis
or self-inflicted alopecia
from excessive grooming.