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The causes of crusty scabs: Mange, allergies, infections, and more. There are so many reasons that dogs may get crusty scabs, so we've broken them down in easily digestible chunks.
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The most common cause of allergy symptoms in dogs is pollen which causes symptoms when inhaled as well as when contacting the skin.

We don't know the reason why some dogs develop allergies.

Allergic dermatitis can cause itchy skin, hair loss, redness, bumps, scabs, darkened skin, moist skin, and abnormal odors.

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