A Change in Pet Behavior
Certain pets are very sensitive to flea bites making them bite and scratch almost uncontrollably. Not only do fleas cause sharp pain when they bite, their salivary glands give off a substance that’s irritating to many pets.
In fact, the most common dermatologic disease of domesticated dogs in the United States is something called Flea Allergy Dermatitis (FAD) which is induced by a variety of histamine-like compounds found in their saliva. Cats can also develop FAD which is one of the major causes of feline miliary dermatitis.
So, if you see a change in your pet’s behavior or notice loss of hair or sores, fleas may be the culprit.