What large dogs have short hair?

I have been looking at dogs to get a puppy. I like the “gentle giants.” However, I do want one that will run with me as well. Anyway, I like the St Bernards, German Shepherds, and Great Danes. However, in doing my research, I discovered that they all shed. A lot. I don’t want a dog that everyone and their brother will be allergic to. What do you suggest? German Shepherd is about the smallest I am willing to go.