Flea allergy is the most common cause of itching and scratching in dogs and cats. When a flea bites, it injects a small amount of saliva into the skin.
Flea allergy dermatitis is a common cause of itching and scratching in dogs and cats.Since flea allergy is often intensely itchy, a veterinarian or veterinary dermatologist may prescribe medications such as cortisone (prednisone, corticosteroids) to provide more immediate itch relief.
Flea allergy dermatitis is an allergic reaction to flea saliva. A single flea bite can cause your dog to go into a scratching frenzy, particularly around areas that fleas seek to hide, such as the ears, armpits, hips, back, under the collar, skin folds, and the base of the tail.

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Dermatitis refers to a variety of issues that cause inflamed, often itchy, skin in dogs.Itching, scratching, and excessive licking or biting are common signs of dermatitis in dogs. Dermatitis may occur because of secondary bacterial infections .
Dog itching and chewing self. Signs of dog skin allergies include excessive scratching, licking and chewying.Skin allergies (also called allergic dermatitis) happen when a dogs immune system overreacts to a substance in the environment, on the skin, or in food.

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Flea allergy dermatitis is a hypersensitivity disorder in which the affected individual is sensitive to the saliva in the bites of fleas. Diagnosis is based on history and clinical signs. Dogs develop itch and skin lesions on the caudal dorsum and tailhead...
Flea Allergy Dermatitis is basically an allergic reaction caused by flea bites.Excessive scratching or biting, particularly around the tail, lower back, belly, or thighs.Hair loss from all the licking and scratching.
Flea allergy dermatitis (FAD) the most common skin disease in dogs. A single flea bite triggers an intense allergic reaction in sensitized dogs. Hair loss and scratching concentrate on the lower back, tail base, and inner thighs.