[4doggiemama]

I have a 1 yr. old 4.5 lb. Yorkie, Chipper, and a 8 mo. old 6 lb. Pommie, Snowboy. I always put them in separate x-pens when I am gone, even for an hour. There is too much weight different for them to be together without my supervision. Sometimes, without even meaning to, Snowboy will get too rough with Chipper. There have been times when I will take Snowboy and put him in his x-pen to help him cool down. Maybe a behaviorist, obedience training, making sure Macie knows who is boss---any of these may be an option. Wish you luck.