Flea allergy dermatitis in dogs (FAD) is the most common dermatological ... reaction including lots of scratching, self-trauma, and hair loss, as well as raw sores on the skin which can become ...

itchiness and hair loss. The bacterial reaction can also be related to another infestation. For example, a dog that has a flea infestation will initially itch due to the allergic reaction from the ...

An allergic reaction to a dog or cat can cause sneezing, nasal congestion, itchy eyes, hives and other symptoms, according to the Mayo Clinic. The symptoms are the body's response to an allergen ...