I was wondering if anyone could explain this to me. Casey is now 8 months old, and is really challenging Hunter. She will push out the door first, If Hunter is being petted she tries to push in between. When Hunter walks she will try to heard her the way she wants her to go. Basically she is being a brat. Hunter usually will allow this until she gets frustrated and then will try to mount Casey. I am not sure if it is their way of figuring out who is "top dog" or what. I have been told to just let them work it out, but Casey can be such a jerk it is hard not to step in. Is Casey just a teen puppy or trying to be the leader?