When your dog nips at you, don't just pull away and pat him/her on the head and say bad dog while chowing down on a bowl of it's favorite dog food. Yell Ow, Ouch anything which let's your dog see that he/she has inflicted pain and needs to stop.
2. Say No and Withdraw Hand
When your dog bites or mouths your hand, you should say No firmly. And withdraw your hand. Stop any playful activity you might have been doing with her at the time which made the dog excited. The dog will begin to wonder what's wrong and probably think you are just taking a break which it is not into. The dog will likely whine or nuzzle you to get you to start up again. Resist that puppy eyes s until the animal calms down. Then, give the dog a chew toy. If the dog bites it or plays with it, praise him/her and pet her. The object lesson here is “chewing on toys good, chewing on human hands is bad.
3. Get a Dog Trainer
If you do not have the patience, time or tact to get your dog to stop biting, you can hire a dog trainer who posses the skills to stop your dog unwarranted biting. Remember though, you are the pack leader and you must not only show love, but must be strong, calm and assertive and patient. Being all this while showing no aggression.