I am about to start puppy training in a couple of weeks. However, in the meantime my 9 wk old blk female is having an issue with biting....not the typical mouthing puppy bite. When you are holding her to put on her collar or doing something she loses interest or wants down.... she starts turning her around growling biting at me. I have never had this sort of aggressive behavior from any of my other previous three dogs. I am sure training can correct it when we start...but, any suggestions. Typically, she minds pretty well to be so young.