I have 3 GSD's.. oldest is a 6yr old male, female 4yrs old and 1 1/2 yr old male. My female did not have any aggression towards the older male until 6 months or so after we brought the puppy into the family. She is loving, and very mother like to the puppy but each day she will growl and push around the older male. The older male never instigates a fight with her and always just ignores her when she gets an attitude towards him- although sometimes he will fight back for a min until we yell at them to stop. Its like she is pushing him around showing him she is the leader of the pack. She does this everyday and its quite annoying and I feel bad for the older male. She will growl, paw at his back, and then will instantly smell his rear-end. I am assuming this is some kind of behavioral thing with her, but I would like to somehow fix this problem. Please help!