Maybe try baby gates? That way they can both see each other but they will have space. That's what I had to do when I first adopted my frenchie Diva, she was so mean to my EB Gio that she would attack him. Now they are the best of friends! It might work for your two even though they already know each other. And I wouldn't leave them home alone together, if you could put one in a different room that you can close off would probably be best. But I'm sure others will be along soon with help! Keep us updated, and post pics of your babies!!