I was very worried at first but for the most part she is very gentle with him. I don't allow rough housing in the house. From any of my babies. Skin and fur. Haha! So when Dixie gets that way she goes outside. Bentley eggs her on sometimes. I don't let them outside in the backyard w/o supervision wither. Outside is where I worry most. She starts running so fast and I worry she will run into him. She isn't huge but she can certainly knock even me over running like that. So I always go with them. I don't worry that much about it though. I watch closely but she seems to know he is tiny. I doubt they will ever be able to play really tho. She can't play with my doxie either. So we go to the dog park so she can be rough and get that out. We are teaching her that to play with Bentley she needs to lay down so she is closer to his height. I don't think size is why Bentley is grumpy. Haha! He lived with 3 large (larger than Dixie) dogs while my husband was deployed. I'm hoping with some adjustment time, they will be cuddled up on the couch together. Dixie isn't allowed right now bc that's Bentley's "safe" place.