Rottweiler and small dog
My boyfriend just got a 9 week male rottweiler puppy. I have a 3 year old bichon frise/shih tzu mix. They are getting along pretty well. My dog will tell him when she's had enough but I'm more afraid of when he becomes a big dog.
I'm so afraid he will, if not intentional, accidentally kill her. If trained properly, will he know to play gentle with her, even if she annoys him?
When raised around small children, small dogs, cats or other pets, Rottweilers adapt and accept them readily. I really don't think you need to worry that your boyfriends Rottie will kill your dog - that is VERY unlikely to happen.
Of course, when there's a significant size difference, any big dog can accidentally hurt a smaller one, but if they're raised together with supervision and corrected if they play too rough, you can minimize, or eliminate, any such incidents.
Hope this puts your mind at rest and I wish you the best of luck with both dogs.