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you need to call a vet and get him checked, but the first thing that came to mind if this is a sudden thing, is that he may have walked through some caustic or acidic material which is making his paws itch or burn. Call the vet. He should not be doing this.
My first thought is ALLERGIES. Generally paw chewing is a food allergy. How long has he been doing this? Does his food or treats contain beef? Have you recently changed his food or treats?