Shepherd is a type label more than a single breed. Listings use it mostly for German Shepherds and German Shepherd mixes, but Australian Shepherds, Belgian and Dutch Shepherds, English Shepherds and crosses with other dogs turn up too. What they share is herding or flock-guarding ancestry, which is why so many are watchful, quick to learn and tuned in to their people.
Most are medium to large, athletic and covered in a thick coat that sheds. Expect a dog in the 45 to 90 pound range, living ten to fourteen years. In Missoula, that ancestry fits households that hike, train and spend real time at home, because a bored Shepherd-type dog may bark, pace or chew. Ancestry varies from dog to dog, so a listing's description of size, energy and coat says more than the label.