|This might be an indication that your pet might be suffering from a condition called, flea allergy dermatitis (FAD). The most common allergy that animals have
is flea allergy dermatitis. It is caused by the fleas' saliva, which your pet can
develop an allergy to, as there are
15 different allergens in their saliva.
Dogs and cats can develop flea saliva
allergies at any point in their life, and
once they have it, it is seldom rectified.