My dog keeps licking his leg until it's raw!?

My Great Dane is obsessively licking his front legs until they are raw, red, and bleeding. I don't know why he does this. Before he does this, his legs look normal; the skin is not red and the fur is good. After he obsessively licks the area, then the skin is missing fur, is red, and bloody. What is... show more My Great Dane is obsessively licking his front legs until they are raw, red, and bleeding. I don't know why he does this. Before he does this, his legs look normal; the skin is not red and the fur is good. After he obsessively licks the area, then the skin is missing fur, is red, and bloody.

What is this? Is it an allergy? I doubt it's an allergy because this occurs during all seasons and he is predominantly indoors. Should I buy some hydrocortisone spray for dogs?
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