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Often an untrimmed nail can be to blame. If he is licking both legs, he might have itchy skin caused by a food allergy, especially if you've recently changed his food. ... If everything checks out, then the most likely cause of the licking is boredom, habit, anxiety or a way of self-soothing.
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In dogs, excessive front leg licking can arise as a result of atopy (intolerance to environmental allergens such as pollens, molds, dust, and dust mites).

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