My Berner is a 11 month old puppy and her name is Harper. I also have a 12 year old male, Murphy. Harper is constantly in Murphy’s face sometimes even jumping on him and he gets super mad and barks at her. She is so stubborn that she won’t stop until I chase her down and put her in her bed. Ugh it’s so frustrating. He has a little arthritis in his back legs so when she does this he falls down. I am so stressed out because I’m afraid she’s gonna hurt him. I had another female who passed in December and Murphy and her got along great. Help me solve this problem. Harper has been in lots of training classes but it all goes out the window once we get home!