I agree with Mysts! Do not allow this behavior...a pup thinks that ANY attention is good attention. So for your BF to pay attention to her when she is doing this is making the situation worse. Do as Mysts advised above, and if that doesn't work, put her in a time out or completely ignore her...no eye contact especially. It will work, just be consistent. My pup was doing this with my DH, he followed my example, and now she hardly bites / nips at all. She is 17 weeks.
HTH
