Nail-biting in dogs is similar to that in people is that it can have either medical or behavioral causes or both. Step one is to have your dog examined by your veterinarian to ensure she has no medical problems, such as a fungal infection. Step two is to pay attention to what is going on when the chewing occurs and how you and others respond to it. Some dogs will chew when stressed by events going on in or around the household. When their owners or others react to the chewing--either positively or negatively--that reinforces the behavior.
When the chewing is a stress-response, there are two things you can do. The first is to identify what's stressing your dog and remove it. The second is to distract your dog before she starts chewing by tossing a toy for her to get, calling her toward you and praising her in a low confident voice (babytalk increases dogs' stress), or otherwise taking her mind off the chewing.
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diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
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If you have a medical emergency, call your doctor or 911 immediately.