The McNab is a working stock dog from Northern California, developed in the late nineteenth century by Scottish rancher Alexander McNab, who crossed collie-type dogs he brought from Scotland with local herding dogs to move sheep and cattle across rough hill country. Ranchers still value it for working stock with quick, independent judgment. McNabs have a short, smooth coat, usually black or red with white markings, upright or semi-erect ears, and compact, tight feet built for agility.
Most major kennel clubs do not recognize the breed, so appearance varies more than in show breeds, and many dogs called McNab in shelters are crosses. Typical McNabs are bright, tireless and deeply attached to their own people while reserved with strangers. They tend to thrive with an experienced owner who can offer a real job, whether herding, dog sports or long daily outings, plus calm, consistent training.