I have a 6 month old pembroke welsh corgi that has been being aggressive and now biting. She has been in training classes and knows basic obedience. She is mostly possessive aggressive but also fights my other dog and doesn't like being touched or leaned over in certain ways. We are doing NILIF but it doesn't seem to be doing much. We had a behaviorist come and she told us to jerk and spray the dog and now she is really bad-biting and growling non-stop. She has bitten me a lot over nothing. When we do the trade up game she will drop her bone (which I am holding at all times) and take the treat. After a few repetitions she won't take the treat but just snarls and bites me. Like I said, this is getting worse now that we had this other trainer, but we don't squirt or yank her anymore. If I even come near her sometimes she will lunge at me. I am scared of her and don't know what to do. She is also attacking our 5 yr old sheltie a lot more too.