[fostermom]

Were these dogs dragging long lines so that you had some reasonably safe way of intervening IF they did get into a fight? Again, dogs can be fine together and seem to get along initially, until one decides he wants to challenge the status quo...it can happen in an instant with no warning. And as you just said, the rott didn't stand a chance, and, as you've also said, you're not crazy enough to jump in if the other dog decides to take on your rott. Are these dogs neutered?? That might stack the odds in your favor a bit. You might luck out and nothing will happen...but be aware that there is a GOOD chance there will be a fight unless appropriate precautions are made.