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Licking is often due to skin irritation triggered by parasites or allergies. Some parasites, such as the sarcoptes mite, are too small to see with the eye but make the dog incredibly itchy. Therefore it's important to rule out all parasites, not just fleas. A common cause of itchiness is an allergic reactions to allergens in the environment such as pollens, mold spores, dust mites, or food.
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