Dog Chewing Nails. An exposed and untreated wound may lead to infection and make your dog itch. Like in humans, airborne allergens often cause intense itchiness.

These behaviors can also be triggered by other allergic reactions, such as those from food allergies. Your dog may be chewing his nails because the nail bed has a fungal infection. If you notice your dog displays this type of behavior, you will have to get veterinary help.