I totally know all about the paranoia! Georgie was 1lb when we brought him home I was so nervous more because Coco was 75lbs. We didn't leave them alone in the same room for a long time but it's so different with Coco than any other dog Georgie is around. She has always been so gentle with Georgie and as a matter of fact he is the boss and always has been. He will put his chin on a toy so Coco won't get it and she won't she will just walk away. She does the same with treats and will sit and wait for him to finish drinking water out of HER water bowl! I always tell people Boxer's are amazing