I have a red heeler mix puppy who is about 4 months old. We rescued her from the street when she was about 6 weeks old, suffering from malnutrition and with a bad case of worms. Now she is very possesive of me and keeps trying to herd our 4 year old beagle. She also becomes jealous when the beagle gets any attention. How do I train her to stop herding my sweet gentle beagle and allow him to share the affection? Every time he starts to get petted, she runs up, tries to nip his collar and push herself in front of him.