My girl Mila (7 Months) nipped my girlfriend in her chin last night. Really got her good. Shes ok and she understands shes just a puppy but this is getting out of hand. If she nips me while playing, a stern no gets her to stop immediately most times, if she continues though I stop play and she usually gets the idea, but it seems like she has no respect for anyone but me. How do I get her to not nip at others? Anyone have any tips for this behavior would really appreciate it.