The breeder where we are getting our OEM puppy from, got a couple of terriers, her dughter is showing them as a junior handler. She says she can see a big difference in her OEM's now, how they react to small dogs. Before when she showed them, and a small dog got up in their faces they got nervous, now she says they are cool with it. If a small dog starts barking at them, they look like they are thinking "ohhh well, another one of those". I think mainly it is because a lot of our big dogs, don't get to get used to small dogs from when they are real young, so they are simply not used to something that little and something that barks with a very aggrevating voice.
When I had my danes I also had a min. Schnauzer, she was great with the big dogs, they are almost like a big dog in a small package.
Marit