I need advice on a new collar for my EM, she is 6 months old and about 80 lbs ......Here is my problem she is being either defiant or just a brat. I am not sure if she is hitting another "stage" or if she is just being stubborn. Lately when she has decided that she doesn't want to do something she will sit or try to turn and bolt on me. Last week we were getting into the car when she decided that she did not want to do this, after a few moments of trying to reason with her she tried to back out of her collar thank god I was able to grab her collar so she didn't completely get out of it. I am wondering what opinions others have on collars, I have always used a choke collar on all my large breed dogs. Thanks everyone in advance!!!!