Shepherd is a label for a type of dog, not one breed. On Savannah listings it most often points to a German Shepherd or a German Shepherd mix, though Australian Shepherds, Belgian and Dutch Shepherds and crosses with Labs or Huskies also carry the name. What they share is ancestry in herding and flock-guarding work.
Most are medium to large, athletic and quick to learn, with a thick coat that sheds year-round. Many stay close to their people and can be reserved with strangers. In Savannah, that coat and the long humid summers matter as much as the temperament, because a dog built for a day of work still needs shade, water and an easy pace from May through September. Backgrounds vary, so judge the dog in front of you rather than the label.