I recently got back a puppy I had sold 3 months ago. She is a cocker spaniel. The previous owners told me she kept biting her kids in the face. When they brought her back i noticed the 5-6 year old girl was more in charge of Mom than Mom in charge of her. We have noticed that when you go to reach for her on her back from behind she will turn around and bite. She also doesn't like to be on her back in your arms for very long. She doesn't seem afraid of any certain sex, but has nipped and growled more at males than females. Both kids were girls. I am certain she was mistreated, but now how do I break her of the nipping, before she hurts somebody.